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Solutions 10-19

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By Mike ⋅ May 8, 2009 ⋅ Post a comment

Calculate the sum of all the primes below two million.

By Mike ⋅ May 18, 2009 ⋅ Post a comment

What is the greatest product of four numbers on the same straight line in the 20 by 20 grid?

By Mike ⋅ May 19, 2009 ⋅ 2 comments

What is the value of the first triangle number to have over five hundred divisors?

By Mike ⋅ May 18, 2009 ⋅ One comment

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

By Mike ⋅ May 18, 2009 ⋅ Post a comment

Find the longest sequence using a starting number under one million.

By Mike ⋅ April 19, 2009 ⋅ Post a comment

Starting in the top left corner in a 20 by 20 grid, how many routes are there to the bottom right corner?

By Mike ⋅ May 18, 2009 ⋅ One comment

What is the sum of the digits of the number 2^1000?

By Mike ⋅ May 13, 2009 ⋅ 2 comments

How many letters would be needed to write all the numbers in words from 1 to 1000?

By Mike ⋅ April 1, 2009 ⋅ 13 comments

Find the maximum sum travelling from the top of the triangle to the base.

By Mike ⋅ March 26, 2009 ⋅ Post a comment

How many Sundays fell on the first of the month during the twentieth century?