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Pentagonal Numbers

This tag is associated with 2 posts

Project Euler 44 Solution

By ⋅ April 17, 2009 ⋅ 6 comments

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

Project Euler 45 Solution

By ⋅ April 10, 2009 ⋅ Post a comment

Find the next triangle number that is also pentagonal and hexagonal after 40755

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Project Euler Level 24