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 A166069 #16 Mar 17 2024 02:12:21 %S A166069 120,672,30240,32760,523776,2178540,23569920,45532800,142990848, %T A166069 459818240,1379454720,1476304896,14182439040,31998395520,43861478400, %U A166069 51001180160,66433720320,153003540480,403031236608,518666803200 %N A166069 Multiply perfect numbers k such that sigma(k)/k > 2. %C A166069 Subsequence of multiply perfect numbers (A007691). Numbers k = A007691(n) such that sigma(A007691(n))/A007691(n) > 2. Numbers k = A007691(n) such that A054030(n) > 2. %H A166069 Charles R Greathouse IV, <a href="/A166069/b166069.txt">Table of n, a(n) for n=1..1587</a> %H A166069 Achim Flammenkamp, <a href="http://wwwhomes.uni-bielefeld.de/achim/mpn.html">The Multiply Perfect Numbers Page</a> %e A166069 For n = 1 the a(1) = 120, sigma(120) / 120 = 360 / 120 = 3, i.e. > 2. %o A166069 (PARI) isok(n) = sn = sigma(n)/n ; (type(sn) == "t_INT") && (sn > 2); \\ _Michel Marcus_, Oct 24 2013 %K A166069 nonn %O A166069 1,1 %A A166069 _Jaroslav Krizek_, Oct 06 2009 %E A166069 Extended by _Charles R Greathouse IV_, Oct 12 2009