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 A160321 #15 Jun 28 2018 07:17:21 %S A160321 84,270,1488,1638,24384,35640,199584,2142720,12999168,100651008, %T A160321 208565280,240589440,470564640,3899750400,6039429120,25769607168, %U A160321 36639203328,53798734080,231758392320,314039721600,412316073984,5566503720960,5967138078720,302512616524800 %N A160321 Numbers n for which sigma(n)/n=k+2/3 with integer k. %e A160321 84 is in the sequence because sigma(84)/84=224/84=2+2/3 %e A160321 270 is in the sequence because sigma(270)/270=720/270=2+2/3 %Y A160321 Cf. A160320 (sigma(n)/n=k+1/3), A159907 (sigma(n)/n=k+1/2). %K A160321 nonn %O A160321 1,1 %A A160321 J.C.Klein (hklein(AT)planet.nl), May 08 2009 %E A160321 a(10)-a(18) from _Donovan Johnson_, May 26 2009 %E A160321 a(19)-a(24) from _Michel Marcus_, Sep 21 2012