Multiples of 3 and 5
Even Fibonacci numbers
Largest prime factor
Largest palindrome product
Sum square difference
10001st prime
Largest product in a series
Special Pythagorean triplet
Summation of primes
Large sum
Longest Colletz sequence
Power digit sum
Factorial digit sum
Lexicographic permutations
1000-digit Fibonacci number
Distinct powers
Digit fifth powers
Digit factorials
Self powers
Merge https://github.com/michele-angrisano/Project_Euler