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 A028502 #22 Nov 30 2019 17:50:20 %S A028502 95295817,124035913,749931337,4275383113,47268697363953913 %N A028502 2772-hyperperfect numbers: n = 2772*(sigma(n)-n-1) + 1. %C A028502 10^19 < a(6) <= 186690534609915040044368953. - _Max Alekseyev_, Nov 30 2019 %H A028502 Judson S. McCranie, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL3/mccranie.html">A Study of Hyperperfect Numbers</a>, Journal of Integer Sequences, Vol. 3 (2000), Article 00.1.3. %Y A028502 Cf. A000396, A007593, A220290, A028499, A028500, A028501, A034916. %K A028502 hard,more,nonn %O A028502 1,1 %A A028502 _Jud McCranie_ %E A028502 a(5) from _Max Alekseyev_, Nov 18 2019