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 A364662 #13 Aug 01 2023 11:16:00 %S A364662 1,61,73,133,145,193,253,397,457,481,493,553,565,613,625,661,673,733, %T A364662 757,793,817,853,913,973,997,1033,1093,1213,1237,1285,1321,1453,1513, %U A364662 1537,1645,1657,1681,1813,1825,1873,1933,2077,2113,2173,2233,2245,2293,2413,2497,2533,2581,2593,2653,2713 %N A364662 Numbers k such that sigma(k) < sigma(k+1) < sigma(k+2) < sigma(k+3). %H A364662 Seiichi Manyama, <a href="/A364662/b364662.txt">Table of n, a(n) for n = 1..10000</a> %o A364662 (PARI) isok(n) = sigma(n)<sigma(n+1) && sigma(n+1)<sigma(n+2) && sigma(n+2)<sigma(n+3); %Y A364662 Cf. A050944, A053224, A364659. %K A364662 nonn,easy %O A364662 1,2 %A A364662 _Seiichi Manyama_, Aug 01 2023