Dreamshire

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Common Routines

This tag is associated with 29 posts

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.

By Mike Molony ⋅ April 11, 2009 ⋅ Post a comment

Count the values of C(n,r), for 1 ≤ n ≤ 100, that exceed one-million.

By Mike Molony ⋅ April 10, 2009 ⋅ 2 comments

Find how many Lychrel numbers are there below ten-thousand.

By Mike Molony ⋅ April 11, 2009 ⋅ 2 comments

Counting primes that lie on the diagonals of the spiral grid.

By Mike Molony ⋅ June 3, 2009 ⋅ 7 comments

Find a set of five primes for which any two primes concatenate to produce another prime.

By Mike Molony ⋅ May 5, 2009 ⋅ One comment

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

By Mike Molony ⋅ December 15, 2013 ⋅ Post a comment

Right triangles with integer coordinates

By Mike Molony ⋅ July 19, 2011 ⋅ 11 comments

Investigating a square digits number chain with a surprising property.

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