Talk:Centered pentagonal number

This article is within the scope of WikiProject Numbers, a collaborative effort to improve the coverage of Numbers on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.NumbersWikipedia:WikiProject NumbersTemplate:WikiProject NumbersNumbers articles

I'm afraid the formula is not correct; it should read

P_{n}={{5n^{2}+5n+2} \over 2},n\geq 1

See also the Mathworld article to which you link at the page bottom. — Preceding unsigned comment added by 91.217.55.78 (talk) 10:19, 14 February 2018 (UTC)[reply]