What is the largest 1 to 9 pandigital that can be formed by multiplying a fixed number by 1, 2, 3, … ?
Find the value of p ≤ 1000 which produces the most integer right triangles.
Compose Champernowne’s constant
Find the largest n-digit pandigital prime that exists
Count how many ‘triangle words’ a list of common English words contain.
Find the sum of all pandigital numbers with an unusual sub-string divisibility property.
Find the smallest pair of pentagonal numbers whose sum and difference is pentagonal.
Find the next triangle number that is also pentagonal and hexagonal after 40755
Find the smallest odd composite that cannot be written as the sum of a prime and twice a square.
Find the first four consecutive integers to have four distinct primes factors.