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 A227768 #9 Jul 30 2013 16:43:54 %S A227768 0,0,0,0,1,0,9963793783910270786529635084437882643939328000 %N A227768 First n-fold perfect number divided by 14182439040, or 0 if the quotient is not an integer. %C A227768 The first n-fold perfect numbers are A007539(n) = 1, 6, 120, 30240, 14182439040, .., for n = 1, 2, 3, 4, 5, ... %C A227768 For additional comments, references, links, and cross-refs, see A007539 and A227765. %H A227768 T. D. Noe, <a href="/A227768/b227768.txt">Table of n, a(n) for n = 1..8</a> %F A227768 a(n) = A007539(n)/14182439040 for n = 5, 7, 8. %e A227768 The first 6-fold perfect number is A007539(6) = 154345556085770649600, and 154345556085770649600/14182439040 = 119711504640/11 is not an integer, so a(6) = 0. %Y A227768 Cf. A007539, A227765, A227766, A227767, A227769. %K A227768 nonn %O A227768 1,7 %A A227768 _Jonathan Sondow_, Jul 29 2013