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This tag is associated with 31 posts

What is the millionth lexicographic permutation of the digits 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9?

By Mike Molony ⋅ April 30, 2009 ⋅ 6 comments

Find the value of d < 1000 for which 1/d contains the longest recurring cycle.

Find a quadratic formula that produces the maximum number of primes for consecutive values of n.

By Mike Molony ⋅ May 2, 2009 ⋅ One comment

Find the sum of both diagonals in a square spiral.

By Mike Molony ⋅ April 8, 2009 ⋅ One comment

Find the sum of all numbers which are equal to the sum of the factorial of their digits.

By Mike Molony ⋅ May 25, 2009 ⋅ 2 comments

Compose Champernowne’s constant

By Mike Molony ⋅ March 26, 2009 ⋅ 2 comments

Find the largest n-digit pandigital prime that exists

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.

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