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Pentagonal Numbers

This tag is associated with 3 posts

Project Euler Problem 78 Solution

By Mike ⋅ April 19, 2009 ⋅ Post a comment

Investigating the number of ways in which coins can be separated into piles.

Project Euler Problem 44 Solution

By Mike ⋅ April 17, 2009 ⋅ One comment

Find the smallest pair of pentagonal numbers whose sum and difference is pentagonal.

Project Euler Problem 45 Solution

By Mike ⋅ April 10, 2009 ⋅ 2 comments

After 40755, what is the next triangle number that is also pentagonal and hexagonal?

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