Find the maximum remainder when (p − 1)n + (p + 1)n is divided by p2 for prime p.
Find the 2000th hexagonal tile in which the differences between it and its 6 neighbors yield 3 primes.
Find how many Pythagorean triangles allow tiling with a perimeter < 100,000,000.
The prime factorisation of binomial coefficients
Find the number of factors in an enormous factorial.
Find a minimum path sum in a matrix from the top left to the bottom right corners by moving up, down, left or right.
Find a set of terms that produce longest set of consecutive digits
Find the sum of the perimeters of all almost equilateral triangles with integral side lengths and area.
Find the smallest member of the longest amicable chain
Find the largest square number formed by pairs of encoded anagrams.