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 A218430 #21 May 13 2023 20:00:24 %S A218430 54,2744280,6191640,182494620,653425920,702989280,27025270272, %T A218430 72475361280,76172903718912,15224461545984768,1688635722988634112, %U A218430 5953066676035614584064,1608903162935227680030720,14600472124349965895417376,2263986000385276007625523200 %N A218430 Numbers k for which sigma(k)/k - 2/9 is an integer. %C A218430 a(9) > 10^11. - _Donovan Johnson_, Nov 01 2012 %C A218430 a(9) > 10^12. - _Giovanni Resta_, Nov 04 2012 %C A218430 Note that there are no terms here with abundancy 11/9 (k=1) or 29/9 (k=3). - _Michel Marcus_, Jun 25 2013 %Y A218430 Cf. A218414, A160320, A218415, A218416, A160321, A218417, A218418. %K A218430 nonn %O A218430 1,1 %A A218430 _Zdenek Cervenka_, Oct 28 2012 %E A218430 a(4)-a(8) from _Donovan Johnson_, Nov 01 2012 %E A218430 More terms from _Michel Marcus_, Jun 25 2013