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 A259632 #40 Dec 29 2016 05:28:47 %S A259632 -2,-2,-3,-2,0,28,199,483,9040,143814,306295,963844,5155067,81053615, %T A259632 1334916470,29106956400,58655156000,1817551640000,56466287000000, %U A259632 376943530000000,1144451930000000,41803527000000000 %N A259632 a(n) = floor(exp(H_k)*log(H_k)) - sigma(k) where k is the n-th colossally abundant number (Sequence A079526 applied to the colossally abundant numbers (A004490).) %C A259632 It follows easily from the work of Lagarias that the Riemann hypothesis is equivalent to this sequence's being nonnegative except for the first four terms. %H A259632 J. C. Lagarias, <a href="http://www.jstor.org/stable/2695443">An elementary problem equivalent to the Riemann hypothesis</a>, Am. Math. Monthly 109 (#6, 2002), 534-543. %Y A259632 Cf. A004490, A079526. %K A259632 sign %O A259632 1,1 %A A259632 _Gene Ward Smith_, Dec 17 2016