Talk:Centered pentagonal number

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


 * $$P_{n}={{5n^2 + 5n + 2} \over 2}, n\geq1$$

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)