This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A227766 #11 Jul 30 2013 16:47:01 %S A227766 0,0,1,252,118186992,1286212967381422080, %T A227766 1177590816228652902165411689487379360536196206821376000 %N A227766 First n-fold perfect number divided by 120, or 0 if the quotient is not an integer. %C A227766 The first n-fold perfect numbers are A007539(n) = 1, 6, 120, 30240, 14182439040, ..., for n = 1, 2, 3, 4, 5, ... %C A227766 For additional comments, references, links, and cross-refs, see A007539 and A227765. %H A227766 T. D. Noe, <a href="/A227766/b227766.txt">Table of n, a(n) for n = 1..8</a> %F A227766 a(n) = A007539(n)/120 if 3 <= n <= 8. %e A227766 The first 4-fold perfect number is A007539(4) = 30240, so a(4) = 30240/120 = 252. %Y A227766 Cf. A007539, A227765, A227767, A227768, A227769. %K A227766 nonn %O A227766 1,4 %A A227766 _Jonathan Sondow_, Jul 29 2013