Dreamshire

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Solutions 10 – 50

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By Mike Molony ⋅ May 18, 2009 ⋅ 5 comments

Find the greatest product of four adjacent numbers in the same direction in a grid.

Count how many letters would be needed to write all the numbers in words from 1 to 1000.

Calculate the sum of all the primes below two million.

By Mike Molony ⋅ May 5, 2009 ⋅ 6 comments

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

By Mike Molony ⋅ May 2, 2009 ⋅ One comment

Find the sum of both diagonals in a square spiral.

By Mike Molony ⋅ April 30, 2009 ⋅ 6 comments

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

By Mike Molony ⋅ April 28, 2009 ⋅ 6 comments

Find the sum of all pandigital numbers with an unusual sub-string divisibility property.

By Mike Molony ⋅ April 27, 2009 ⋅ One comment

Count how many ‘triangle words’ a list of common English words contain.

By Mike Molony ⋅ April 23, 2009 ⋅ 9 comments

Find the sum of all eleven primes that are truncatable from both left to right and right to left.

By Mike Molony ⋅ April 22, 2009 ⋅ 8 comments

Discover all the fractions with an unorthodox cancelling method.

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