Dreamshire

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Archive for May, 2009

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

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 ⋅ May 25, 2009 ⋅ 2 comments

Compose Champernowne’s constant

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 ⋅ May 27, 2009 ⋅ 16 comments

Find the smallest prime which, by replacing part of the number with the same digit, is part of an eight prime value set.

By Mike Molony ⋅ May 28, 2009 ⋅ One comment

Using a brute force attack, decrypt the cipher using XOR encryption

By Mike Molony ⋅ May 5, 2009 ⋅ One comment

Find the minimal path sum from the left column to the right column.

Find the base/exponent pair in the file has the greatest numerical value

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