Dreamshire

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Solutions 10 – 50

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Calculate the sum of all the primes below two million.

By Mike Molony ⋅ May 18, 2009 ⋅ 5 comments

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

By Mike Molony ⋅ May 19, 2009 ⋅ 3 comments

Find the value of the first triangle number to have over five hundred divisors

By Mike Molony ⋅ May 18, 2009 ⋅ 6 comments

Find the first ten digits of the sum of one-hundred 50-digit numbers.

By Mike Molony ⋅ May 18, 2009 ⋅ 2 comments

Find the starting number, under one million, that produces the longest Collatz sequence.

By Mike Molony ⋅ April 19, 2009 ⋅ Post a comment

Find the number of routes from the top left corner to the bottom right corner in a rectangular grid.

By Mike Molony ⋅ May 18, 2009 ⋅ One comment

Sum of the digits in 2^1000.

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

By Mike Molony ⋅ April 1, 2009 ⋅ 15 comments

Maximum sum from top to bottom of triangular array.

By Mike Molony ⋅ March 26, 2009 ⋅ Post a comment

Find how many Sundays fell on the first of the month during the twentieth century.

If you don't build your dream, someone will hire you to build theirs.