using System;
using System.Collections.Generic;
using System.Linq;
using BitArray = System.Collections.BitArray;
using BigInteger = System.Numerics.BigInteger;
using TextReader = System.IO.TextReader;
using System.Text;

namespace AtCoderProject
{
    public class Program
    {
        public object Calc()
        {
            primes = Eratosthenes(100000);
            for (int i = 3; i < 100000; i++)
            {
                if (primes.Contains(i) && primes.Contains((i + 1) / 2))
                    sums[i] = sums[i - 2] + 1;
                else
                    sums[i] = sums[i - 2];
            }
            var Q = consoleReader.Int;
            return AllLines(consoleReader.Repeat(Q).Select(CalcImpl));
        }
        int CalcImpl(ConsoleReader cr)
        {
            var l = cr.Int;
            var r = cr.Int;
            if (l > 1)
                return sums[r] - sums[l - 2];
            return
                sums[r];
        }
        HashSet<int> primes;
        int[] sums = new int[100001];

        static HashSet<int> Eratosthenes(int n)
        {
            var primes = new HashSet<int> { 2, 3, 5, 7 };
            var searches = new List<int>();
            for (int i = 10; i < n; i += 10)
            {
                int current;
                current = i + 1;
                if (current % 3 != 0 && current % 7 != 0)
                    searches.Add(current);
                current = i + 3;
                if (current % 3 != 0 && current % 7 != 0)
                    searches.Add(current);
                current = i + 7;
                if (current % 3 != 0 && current % 7 != 0)
                    searches.Add(current);
                current = i + 9;
                if (current % 3 != 0 && current % 7 != 0)
                    searches.Add(current);
            }
            n = searches[searches.Count - 1];
            var sqrtN = (int)Math.Sqrt(n);

            var first = 11;
            while (first <= sqrtN)
            {
                primes.Add(first);
                var next = new List<int>(searches.Count);
                foreach (var item in searches)
                    if (item % first != 0)
                        next.Add(item);

                searches = next;
                first = searches[0];
            }
            foreach (var item in searches)
                primes.Add(item);
            return primes;
        }


        #region いつもの
#pragma warning disable
        private ConsoleReader consoleReader;
        public Program(ConsoleReader consoleReader) { this.consoleReader = consoleReader; }
        static void Main() => Console.WriteLine(new Program(new ConsoleReader(Console.In)).Calc()); static string AllLines<T>(IEnumerable<T> source) => string.Join("\n", source);
    }
    public class ConsoleReader
    {
        private string[] ReadLineSplit() => textReader.ReadLine().Split(Array.Empty<char>(), StringSplitOptions.RemoveEmptyEntries);
        private string[] line = Array.Empty<string>();
        private int linePosition;
        private TextReader textReader;
        public ConsoleReader(TextReader tr) { textReader = tr; }
        public int Int => int.Parse(String);
        public long Long => long.Parse(String);
        public double Double => double.Parse(String);
        public string String
        {
            get
            {
                if (linePosition >= line.Length)
                {
                    linePosition = 0;
                    line = ReadLineSplit();
                }
                return line[linePosition++];
            }
        }
        public class SplitLine
        {
            private string[] splited;
            public SplitLine(ConsoleReader cr) { splited = cr.ReadLineSplit(); cr.line = Array.Empty<string>(); }
            public int[] Int => String.Select(x => int.Parse(x)).ToArray();
            public int[] Int0 => String.Select(x => int.Parse(x) - 1).ToArray();
            public long[] Long => String.Select(x => long.Parse(x)).ToArray();
            public double[] Double => String.Select(x => double.Parse(x)).ToArray();
            public string[] String => splited;
        }
        public SplitLine Split => new SplitLine(this);
        public class RepeatReader : IEnumerable<ConsoleReader>
        {
            ConsoleReader cr; int count;
            public RepeatReader(ConsoleReader cr, int count) { this.cr = cr; this.count = count; }
            public IEnumerator<ConsoleReader> GetEnumerator() => Enumerable.Repeat(cr, count).GetEnumerator();
            System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() => GetEnumerator();

            public IEnumerable<string> String => this.Select(cr => cr.String);
            public IEnumerable<int> Int => this.Select(cr => cr.Int);
            public IEnumerable<int> Int0 => this.Select(cr => cr.Int - 1);
            public IEnumerable<long> Long => this.Select(cr => cr.Long);
            public IEnumerable<double> Double => this.Select(cr => cr.Double);
        }
        public RepeatReader Repeat(int count) => new RepeatReader(this, count);
    }
    #endregion
}

Measured memory_bytes: 24264