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Solutions 10 – 50

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By Mike Molony ⋅ April 10, 2009 ⋅ Post a comment

Find the next triangle number that is also pentagonal and hexagonal after 40755

By Mike Molony ⋅ May 28, 2009 ⋅ 4 comments

Find the smallest odd composite that cannot be written as the sum of a prime and twice a square.

By Mike Molony ⋅ May 5, 2009 ⋅ 6 comments

Find the first four consecutive integers to have four distinct primes factors.

By Mike Molony ⋅ March 24, 2009 ⋅ 9 comments

Find the last ten digits of 1^1 + 2^2 + … + 1000^1000.

By Mike Molony ⋅ June 5, 2009 ⋅ 2 comments

Find arithmetic sequences, made of prime terms, whose four digits are permutations of each other.

By Mike Molony ⋅ April 12, 2009 ⋅ 5 comments

Find the prime number, below one-million, that can be written as the sum of the most consecutive primes.

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