kazuyamaa/multi-language-messages-01 huggingface dataset:
Task: Digital root_Multiplicative digital root
C: #include <stdio.h>

#define twidth 5
#define mdr(rmdr, rmp, n)\
    do { *rmp = 0; _mdr(rmdr, rmp, n); } while (0)

void _mdr(int *rmdr, int *rmp, long long n)
{
    
    int r = n ? 1 : 0;
    while (n) { 
        r *= (n % 10);
        n /= 10; 
    }

    (*rmp)++;
    if (r >= 10)
        _mdr(rmdr, rmp, r);
    else
        *rmdr = r;
}

int main(void)
{
    int i, j, vmdr, vmp;
    const int values[] = { 123321, 7739, 893, 899998 };
    const int vsize    = sizeof(values) / sizeof(values[0]);

    
    printf("Number    MDR    MP\n");
    for (i = 0; i < vsize; ++i) {
        mdr(&vmdr, &vmp, values[i]);
        printf("%6d   %3d   %3d\n", values[i], vmdr, vmp);
    }

    
    int table[10][twidth] = { 0 };
    int tfill[10]         = { 0 };
    int total             = 0;
    for (i = 0; total < 10 * twidth; ++i) {
        mdr(&vmdr, &vmp, i);
        if (tfill[vmdr] < twidth) {
            table[vmdr][tfill[vmdr]++] = i;
            total++;
        }
    }

    
    printf("\nMDR: [n0..n4]\n");
    for (i = 0; i < 10; ++i) {
        printf("%3d: [", i);
        for (j = 0; j < twidth; ++j)
            printf("%d%s", table[i][j], j != twidth - 1 ? ", " : ""); 
        printf("]\n");
    }

    return 0;
}

C#: using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static Tuple<int, int> DigitalRoot(long num)
    {
        int mp = 0;
        while (num > 9)
        {
            num = num.ToString().ToCharArray().Select(x => x - '0').Aggregate((a, b) => a * b);
            mp++;
        }
        return new Tuple<int, int>(mp, (int)num);
    }
    static void Main(string[] args)
    {
        foreach (long num in new long[] { 123321, 7739, 893, 899998 })
        {
            var t = DigitalRoot(num);
            Console.WriteLine("{0} has multiplicative persistence {1} and multiplicative digital root {2}", num, t.Item1, t.Item2);
        }

        const int twidth = 5;
        List<long>[] table = new List<long>[10];
        for (int i = 0; i < 10; i++)
            table[i] = new List<long>();
        long number = -1;
        while (table.Any(x => x.Count < twidth)) 
        {
            var t = DigitalRoot(++number);
            if (table[t.Item2].Count < twidth)
                table[t.Item2].Add(number);
        }
        for (int i = 0; i < 10; i++)
            Console.WriteLine(" {0} : [{1}]", i, string.Join(", ", table[i]));
    }
}
Task: Digital root_Multiplicative digital root
C: #include <stdio.h>

#define twidth 5
#define mdr(rmdr, rmp, n)\
    do { *rmp = 0; _mdr(rmdr, rmp, n); } while (0)

void _mdr(int *rmdr, int *rmp, long long n)
{
    
    int r = n ? 1 : 0;
    while (n) { 
        r *= (n % 10);
        n /= 10; 
    }

    (*rmp)++;
    if (r >= 10)
        _mdr(rmdr, rmp, r);
    else
        *rmdr = r;
}

int main(void)
{
    int i, j, vmdr, vmp;
    const int values[] = { 123321, 7739, 893, 899998 };
    const int vsize    = sizeof(values) / sizeof(values[0]);

    
    printf("Number    MDR    MP\n");
    for (i = 0; i < vsize; ++i) {
        mdr(&vmdr, &vmp, values[i]);
        printf("%6d   %3d   %3d\n", values[i], vmdr, vmp);
    }

    
    int table[10][twidth] = { 0 };
    int tfill[10]         = { 0 };
    int total             = 0;
    for (i = 0; total < 10 * twidth; ++i) {
        mdr(&vmdr, &vmp, i);
        if (tfill[vmdr] < twidth) {
            table[vmdr][tfill[vmdr]++] = i;
            total++;
        }
    }

    
    printf("\nMDR: [n0..n4]\n");
    for (i = 0; i < 10; ++i) {
        printf("%3d: [", i);
        for (j = 0; j < twidth; ++j)
            printf("%d%s", table[i][j], j != twidth - 1 ? ", " : ""); 
        printf("]\n");
    }

    return 0;
}

C++: #include <iomanip>
#include <map>
#include <vector>
#include <iostream>
using namespace std;

void calcMDR( int n, int c, int& a, int& b )
{
    int m = n % 10; n /= 10;
    while( n )
    {
	m *= ( n % 10 );
	n /= 10;
    }
    if( m >= 10 ) calcMDR( m, ++c, a, b );
    else { a = m; b = c; }
}

void table()
{
    map<int, vector<int> > mp;
    int n = 0, a, b;
    bool f = true;
    while( f )
    {
	f = false;
	calcMDR( n, 1, a, b );
	mp[a].push_back( n );
	n++;
	for( int x = 0; x < 10; x++ )
	    if( mp[x].size() < 5 )
	    { f = true; break; }
    }

    cout << "|  MDR  |  [n0..n4]\n+-------+------------------------------------+\n";
    for( int x = 0; x < 10; x++ )
    {
	cout << right << "| " << setw( 6 ) << x << "| ";
	for( vector<int>::iterator i = mp[x].begin(); i != mp[x].begin() + 5; i++ )
	    cout << setw( 6 ) << *i << " ";
	cout << "|\n";
    }
    cout << "+-------+------------------------------------+\n\n";
}

int main( int argc, char* argv[] )
{
    cout << "|  NUMBER  |   MDR    |    MP    |\n+----------+----------+----------+\n";
    int numbers[] = { 123321, 7739, 893, 899998 }, a, b;
    for( int x = 0; x < 4; x++ )
    {
	cout << right << "| "  << setw( 9 ) << numbers[x] << "| ";
	calcMDR( numbers[x], 1, a, b );
	cout << setw( 9 ) << a  << "| " << setw( 9 ) << b << "|\n";
    }
    cout << "+----------+----------+----------+\n\n";
    table();
    return system( "pause" );
}
Task: Digital root_Multiplicative digital root
C: #include <stdio.h>

#define twidth 5
#define mdr(rmdr, rmp, n)\
    do { *rmp = 0; _mdr(rmdr, rmp, n); } while (0)

void _mdr(int *rmdr, int *rmp, long long n)
{
    
    int r = n ? 1 : 0;
    while (n) { 
        r *= (n % 10);
        n /= 10; 
    }

    (*rmp)++;
    if (r >= 10)
        _mdr(rmdr, rmp, r);
    else
        *rmdr = r;
}

int main(void)
{
    int i, j, vmdr, vmp;
    const int values[] = { 123321, 7739, 893, 899998 };
    const int vsize    = sizeof(values) / sizeof(values[0]);

    
    printf("Number    MDR    MP\n");
    for (i = 0; i < vsize; ++i) {
        mdr(&vmdr, &vmp, values[i]);
        printf("%6d   %3d   %3d\n", values[i], vmdr, vmp);
    }

    
    int table[10][twidth] = { 0 };
    int tfill[10]         = { 0 };
    int total             = 0;
    for (i = 0; total < 10 * twidth; ++i) {
        mdr(&vmdr, &vmp, i);
        if (tfill[vmdr] < twidth) {
            table[vmdr][tfill[vmdr]++] = i;
            total++;
        }
    }

    
    printf("\nMDR: [n0..n4]\n");
    for (i = 0; i < 10; ++i) {
        printf("%3d: [", i);
        for (j = 0; j < twidth; ++j)
            printf("%d%s", table[i][j], j != twidth - 1 ? ", " : ""); 
        printf("]\n");
    }

    return 0;
}

Go: package main

import "fmt"


func mult(n uint64, base int) (mult uint64) {
	for mult = 1; mult > 0 && n > 0; n /= uint64(base) {
		mult *= n % uint64(base)
	}
	return
}


func MultDigitalRoot(n uint64, base int) (mp, mdr int) {
	var m uint64
	for m = n; m >= uint64(base); mp++ {
		m = mult(m, base)
	}
	return mp, int(m)
}

func main() {
	const base = 10
	const size = 5

	const testFmt = "%20v %3v %3v\n"
	fmt.Printf(testFmt, "Number", "MDR", "MP")
	for _, n := range [...]uint64{
		123321, 7739, 893, 899998,
		18446743999999999999,
		
		3778888999, 277777788888899,
	} {
		mp, mdr := MultDigitalRoot(n, base)
		fmt.Printf(testFmt, n, mdr, mp)
	}
	fmt.Println()

	var list [base][]uint64
	for i := range list {
		list[i] = make([]uint64, 0, size)
	}
	for cnt, n := size*base, uint64(0); cnt > 0; n++ {
		_, mdr := MultDigitalRoot(n, base)
		if len(list[mdr]) < size {
			list[mdr] = append(list[mdr], n)
			cnt--
		}
	}
	const tableFmt = "%3v: %v\n"
	fmt.Printf(tableFmt, "MDR", "First")
	for i, l := range list {
		fmt.Printf(tableFmt, i, l)
	}
}
Task: Digital root_Multiplicative digital root
C: #include <stdio.h>

#define twidth 5
#define mdr(rmdr, rmp, n)\
    do { *rmp = 0; _mdr(rmdr, rmp, n); } while (0)

void _mdr(int *rmdr, int *rmp, long long n)
{
    
    int r = n ? 1 : 0;
    while (n) { 
        r *= (n % 10);
        n /= 10; 
    }

    (*rmp)++;
    if (r >= 10)
        _mdr(rmdr, rmp, r);
    else
        *rmdr = r;
}

int main(void)
{
    int i, j, vmdr, vmp;
    const int values[] = { 123321, 7739, 893, 899998 };
    const int vsize    = sizeof(values) / sizeof(values[0]);

    
    printf("Number    MDR    MP\n");
    for (i = 0; i < vsize; ++i) {
        mdr(&vmdr, &vmp, values[i]);
        printf("%6d   %3d   %3d\n", values[i], vmdr, vmp);
    }

    
    int table[10][twidth] = { 0 };
    int tfill[10]         = { 0 };
    int total             = 0;
    for (i = 0; total < 10 * twidth; ++i) {
        mdr(&vmdr, &vmp, i);
        if (tfill[vmdr] < twidth) {
            table[vmdr][tfill[vmdr]++] = i;
            total++;
        }
    }

    
    printf("\nMDR: [n0..n4]\n");
    for (i = 0; i < 10; ++i) {
        printf("%3d: [", i);
        for (j = 0; j < twidth; ++j)
            printf("%d%s", table[i][j], j != twidth - 1 ? ", " : ""); 
        printf("]\n");
    }

    return 0;
}

Java: import java.util.*;

public class MultiplicativeDigitalRoot {

    public static void main(String[] args) {

        System.out.println("NUMBER  MDR   MP");
        for (long n : new long[]{123321, 7739, 893, 899998}) {
            long[] a = multiplicativeDigitalRoot(n);
            System.out.printf("%6d %4d %4d%n", a[0], a[1], a[2]);
        }

        System.out.println();

        Map<Long, List<Long>> table = new HashMap<>();
        for (long i = 0; i < 10; i++)
            table.put(i, new ArrayList<>());

        for (long cnt = 0, n = 0; cnt < 10;) {
            long[] res = multiplicativeDigitalRoot(n++);
            List<Long> list = table.get(res[1]);
            if (list.size() < 5) {
                list.add(res[0]);
                cnt = list.size() == 5 ? cnt + 1 : cnt;
            }
        }

        System.out.println("MDR: first five numbers with same MDR");
        table.forEach((key, lst) -> {
            System.out.printf("%3d: ", key);
            lst.forEach(e -> System.out.printf("%6s ", e));
            System.out.println();
        });
    }

    public static long[] multiplicativeDigitalRoot(long n) {
        int mp = 0;
        long mdr = n;
        while (mdr > 9) {
            long m = mdr;
            long total = 1;
            while (m > 0) {
                total *= m % 10;
                m /= 10;
            }
            mdr = total;
            mp++;
        }
        return new long[]{n, mdr, mp};
    }
}
Task: Digital root_Multiplicative digital root
C++: #include <iomanip>
#include <map>
#include <vector>
#include <iostream>
using namespace std;

void calcMDR( int n, int c, int& a, int& b )
{
    int m = n % 10; n /= 10;
    while( n )
    {
	m *= ( n % 10 );
	n /= 10;
    }
    if( m >= 10 ) calcMDR( m, ++c, a, b );
    else { a = m; b = c; }
}

void table()
{
    map<int, vector<int> > mp;
    int n = 0, a, b;
    bool f = true;
    while( f )
    {
	f = false;
	calcMDR( n, 1, a, b );
	mp[a].push_back( n );
	n++;
	for( int x = 0; x < 10; x++ )
	    if( mp[x].size() < 5 )
	    { f = true; break; }
    }

    cout << "|  MDR  |  [n0..n4]\n+-------+------------------------------------+\n";
    for( int x = 0; x < 10; x++ )
    {
	cout << right << "| " << setw( 6 ) << x << "| ";
	for( vector<int>::iterator i = mp[x].begin(); i != mp[x].begin() + 5; i++ )
	    cout << setw( 6 ) << *i << " ";
	cout << "|\n";
    }
    cout << "+-------+------------------------------------+\n\n";
}

int main( int argc, char* argv[] )
{
    cout << "|  NUMBER  |   MDR    |    MP    |\n+----------+----------+----------+\n";
    int numbers[] = { 123321, 7739, 893, 899998 }, a, b;
    for( int x = 0; x < 4; x++ )
    {
	cout << right << "| "  << setw( 9 ) << numbers[x] << "| ";
	calcMDR( numbers[x], 1, a, b );
	cout << setw( 9 ) << a  << "| " << setw( 9 ) << b << "|\n";
    }
    cout << "+----------+----------+----------+\n\n";
    table();
    return system( "pause" );
}

Go: package main

import "fmt"


func mult(n uint64, base int) (mult uint64) {
	for mult = 1; mult > 0 && n > 0; n /= uint64(base) {
		mult *= n % uint64(base)
	}
	return
}


func MultDigitalRoot(n uint64, base int) (mp, mdr int) {
	var m uint64
	for m = n; m >= uint64(base); mp++ {
		m = mult(m, base)
	}
	return mp, int(m)
}

func main() {
	const base = 10
	const size = 5

	const testFmt = "%20v %3v %3v\n"
	fmt.Printf(testFmt, "Number", "MDR", "MP")
	for _, n := range [...]uint64{
		123321, 7739, 893, 899998,
		18446743999999999999,
		
		3778888999, 277777788888899,
	} {
		mp, mdr := MultDigitalRoot(n, base)
		fmt.Printf(testFmt, n, mdr, mp)
	}
	fmt.Println()

	var list [base][]uint64
	for i := range list {
		list[i] = make([]uint64, 0, size)
	}
	for cnt, n := size*base, uint64(0); cnt > 0; n++ {
		_, mdr := MultDigitalRoot(n, base)
		if len(list[mdr]) < size {
			list[mdr] = append(list[mdr], n)
			cnt--
		}
	}
	const tableFmt = "%3v: %v\n"
	fmt.Printf(tableFmt, "MDR", "First")
	for i, l := range list {
		fmt.Printf(tableFmt, i, l)
	}
}
Task: Digital root_Multiplicative digital root
C++: #include <iomanip>
#include <map>
#include <vector>
#include <iostream>
using namespace std;

void calcMDR( int n, int c, int& a, int& b )
{
    int m = n % 10; n /= 10;
    while( n )
    {
	m *= ( n % 10 );
	n /= 10;
    }
    if( m >= 10 ) calcMDR( m, ++c, a, b );
    else { a = m; b = c; }
}

void table()
{
    map<int, vector<int> > mp;
    int n = 0, a, b;
    bool f = true;
    while( f )
    {
	f = false;
	calcMDR( n, 1, a, b );
	mp[a].push_back( n );
	n++;
	for( int x = 0; x < 10; x++ )
	    if( mp[x].size() < 5 )
	    { f = true; break; }
    }

    cout << "|  MDR  |  [n0..n4]\n+-------+------------------------------------+\n";
    for( int x = 0; x < 10; x++ )
    {
	cout << right << "| " << setw( 6 ) << x << "| ";
	for( vector<int>::iterator i = mp[x].begin(); i != mp[x].begin() + 5; i++ )
	    cout << setw( 6 ) << *i << " ";
	cout << "|\n";
    }
    cout << "+-------+------------------------------------+\n\n";
}

int main( int argc, char* argv[] )
{
    cout << "|  NUMBER  |   MDR    |    MP    |\n+----------+----------+----------+\n";
    int numbers[] = { 123321, 7739, 893, 899998 }, a, b;
    for( int x = 0; x < 4; x++ )
    {
	cout << right << "| "  << setw( 9 ) << numbers[x] << "| ";
	calcMDR( numbers[x], 1, a, b );
	cout << setw( 9 ) << a  << "| " << setw( 9 ) << b << "|\n";
    }
    cout << "+----------+----------+----------+\n\n";
    table();
    return system( "pause" );
}

Java: import java.util.*;

public class MultiplicativeDigitalRoot {

    public static void main(String[] args) {

        System.out.println("NUMBER  MDR   MP");
        for (long n : new long[]{123321, 7739, 893, 899998}) {
            long[] a = multiplicativeDigitalRoot(n);
            System.out.printf("%6d %4d %4d%n", a[0], a[1], a[2]);
        }

        System.out.println();

        Map<Long, List<Long>> table = new HashMap<>();
        for (long i = 0; i < 10; i++)
            table.put(i, new ArrayList<>());

        for (long cnt = 0, n = 0; cnt < 10;) {
            long[] res = multiplicativeDigitalRoot(n++);
            List<Long> list = table.get(res[1]);
            if (list.size() < 5) {
                list.add(res[0]);
                cnt = list.size() == 5 ? cnt + 1 : cnt;
            }
        }

        System.out.println("MDR: first five numbers with same MDR");
        table.forEach((key, lst) -> {
            System.out.printf("%3d: ", key);
            lst.forEach(e -> System.out.printf("%6s ", e));
            System.out.println();
        });
    }

    public static long[] multiplicativeDigitalRoot(long n) {
        int mp = 0;
        long mdr = n;
        while (mdr > 9) {
            long m = mdr;
            long total = 1;
            while (m > 0) {
                total *= m % 10;
                m /= 10;
            }
            mdr = total;
            mp++;
        }
        return new long[]{n, mdr, mp};
    }
}
Task: Digital root_Multiplicative digital root
C++: #include <iomanip>
#include <map>
#include <vector>
#include <iostream>
using namespace std;

void calcMDR( int n, int c, int& a, int& b )
{
    int m = n % 10; n /= 10;
    while( n )
    {
	m *= ( n % 10 );
	n /= 10;
    }
    if( m >= 10 ) calcMDR( m, ++c, a, b );
    else { a = m; b = c; }
}

void table()
{
    map<int, vector<int> > mp;
    int n = 0, a, b;
    bool f = true;
    while( f )
    {
	f = false;
	calcMDR( n, 1, a, b );
	mp[a].push_back( n );
	n++;
	for( int x = 0; x < 10; x++ )
	    if( mp[x].size() < 5 )
	    { f = true; break; }
    }

    cout << "|  MDR  |  [n0..n4]\n+-------+------------------------------------+\n";
    for( int x = 0; x < 10; x++ )
    {
	cout << right << "| " << setw( 6 ) << x << "| ";
	for( vector<int>::iterator i = mp[x].begin(); i != mp[x].begin() + 5; i++ )
	    cout << setw( 6 ) << *i << " ";
	cout << "|\n";
    }
    cout << "+-------+------------------------------------+\n\n";
}

int main( int argc, char* argv[] )
{
    cout << "|  NUMBER  |   MDR    |    MP    |\n+----------+----------+----------+\n";
    int numbers[] = { 123321, 7739, 893, 899998 }, a, b;
    for( int x = 0; x < 4; x++ )
    {
	cout << right << "| "  << setw( 9 ) << numbers[x] << "| ";
	calcMDR( numbers[x], 1, a, b );
	cout << setw( 9 ) << a  << "| " << setw( 9 ) << b << "|\n";
    }
    cout << "+----------+----------+----------+\n\n";
    table();
    return system( "pause" );
}

Python: try:
    from functools import reduce
except:
    pass

def mdroot(n):
    'Multiplicative digital root'
    mdr = [n]
    while mdr[-1] > 9:
        mdr.append(reduce(int.__mul__, (int(dig) for dig in str(mdr[-1])), 1))
    return len(mdr) - 1, mdr[-1]

if __name__ == '__main__':
    print('Number: (MP, MDR)\n======  =========')
    for n in (123321, 7739, 893, 899998):
        print('%6i: %r' % (n, mdroot(n)))
        
    table, n = {i: [] for i in range(10)}, 0
    while min(len(row) for row in table.values()) < 5:
        mpersistence, mdr = mdroot(n)
        table[mdr].append(n)
        n += 1
    print('\nMP: [n0..n4]\n==  ========')
    for mp, val in sorted(table.items()):
        print('%2i: %r' % (mp, val[:5]))
Task: Digital root_Multiplicative digital root
C#: using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static Tuple<int, int> DigitalRoot(long num)
    {
        int mp = 0;
        while (num > 9)
        {
            num = num.ToString().ToCharArray().Select(x => x - '0').Aggregate((a, b) => a * b);
            mp++;
        }
        return new Tuple<int, int>(mp, (int)num);
    }
    static void Main(string[] args)
    {
        foreach (long num in new long[] { 123321, 7739, 893, 899998 })
        {
            var t = DigitalRoot(num);
            Console.WriteLine("{0} has multiplicative persistence {1} and multiplicative digital root {2}", num, t.Item1, t.Item2);
        }

        const int twidth = 5;
        List<long>[] table = new List<long>[10];
        for (int i = 0; i < 10; i++)
            table[i] = new List<long>();
        long number = -1;
        while (table.Any(x => x.Count < twidth)) 
        {
            var t = DigitalRoot(++number);
            if (table[t.Item2].Count < twidth)
                table[t.Item2].Add(number);
        }
        for (int i = 0; i < 10; i++)
            Console.WriteLine(" {0} : [{1}]", i, string.Join(", ", table[i]));
    }
}

Go: package main

import "fmt"


func mult(n uint64, base int) (mult uint64) {
	for mult = 1; mult > 0 && n > 0; n /= uint64(base) {
		mult *= n % uint64(base)
	}
	return
}


func MultDigitalRoot(n uint64, base int) (mp, mdr int) {
	var m uint64
	for m = n; m >= uint64(base); mp++ {
		m = mult(m, base)
	}
	return mp, int(m)
}

func main() {
	const base = 10
	const size = 5

	const testFmt = "%20v %3v %3v\n"
	fmt.Printf(testFmt, "Number", "MDR", "MP")
	for _, n := range [...]uint64{
		123321, 7739, 893, 899998,
		18446743999999999999,
		
		3778888999, 277777788888899,
	} {
		mp, mdr := MultDigitalRoot(n, base)
		fmt.Printf(testFmt, n, mdr, mp)
	}
	fmt.Println()

	var list [base][]uint64
	for i := range list {
		list[i] = make([]uint64, 0, size)
	}
	for cnt, n := size*base, uint64(0); cnt > 0; n++ {
		_, mdr := MultDigitalRoot(n, base)
		if len(list[mdr]) < size {
			list[mdr] = append(list[mdr], n)
			cnt--
		}
	}
	const tableFmt = "%3v: %v\n"
	fmt.Printf(tableFmt, "MDR", "First")
	for i, l := range list {
		fmt.Printf(tableFmt, i, l)
	}
}
Task: Digital root_Multiplicative digital root
C#: using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static Tuple<int, int> DigitalRoot(long num)
    {
        int mp = 0;
        while (num > 9)
        {
            num = num.ToString().ToCharArray().Select(x => x - '0').Aggregate((a, b) => a * b);
            mp++;
        }
        return new Tuple<int, int>(mp, (int)num);
    }
    static void Main(string[] args)
    {
        foreach (long num in new long[] { 123321, 7739, 893, 899998 })
        {
            var t = DigitalRoot(num);
            Console.WriteLine("{0} has multiplicative persistence {1} and multiplicative digital root {2}", num, t.Item1, t.Item2);
        }

        const int twidth = 5;
        List<long>[] table = new List<long>[10];
        for (int i = 0; i < 10; i++)
            table[i] = new List<long>();
        long number = -1;
        while (table.Any(x => x.Count < twidth)) 
        {
            var t = DigitalRoot(++number);
            if (table[t.Item2].Count < twidth)
                table[t.Item2].Add(number);
        }
        for (int i = 0; i < 10; i++)
            Console.WriteLine(" {0} : [{1}]", i, string.Join(", ", table[i]));
    }
}

Java: import java.util.*;

public class MultiplicativeDigitalRoot {

    public static void main(String[] args) {

        System.out.println("NUMBER  MDR   MP");
        for (long n : new long[]{123321, 7739, 893, 899998}) {
            long[] a = multiplicativeDigitalRoot(n);
            System.out.printf("%6d %4d %4d%n", a[0], a[1], a[2]);
        }

        System.out.println();

        Map<Long, List<Long>> table = new HashMap<>();
        for (long i = 0; i < 10; i++)
            table.put(i, new ArrayList<>());

        for (long cnt = 0, n = 0; cnt < 10;) {
            long[] res = multiplicativeDigitalRoot(n++);
            List<Long> list = table.get(res[1]);
            if (list.size() < 5) {
                list.add(res[0]);
                cnt = list.size() == 5 ? cnt + 1 : cnt;
            }
        }

        System.out.println("MDR: first five numbers with same MDR");
        table.forEach((key, lst) -> {
            System.out.printf("%3d: ", key);
            lst.forEach(e -> System.out.printf("%6s ", e));
            System.out.println();
        });
    }

    public static long[] multiplicativeDigitalRoot(long n) {
        int mp = 0;
        long mdr = n;
        while (mdr > 9) {
            long m = mdr;
            long total = 1;
            while (m > 0) {
                total *= m % 10;
                m /= 10;
            }
            mdr = total;
            mp++;
        }
        return new long[]{n, mdr, mp};
    }
}