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 A056135 #4 Mar 30 2012 18:51:27 %S A056135 4,8,12,1,20,24,28,2,1,40,44,3,52,56,60,1,68,2,76,5,84,88,92,6,1,104, %T A056135 3,7,116,120,124,2,132,136,140,1,148,152,156,10,164,168,172,11,5,184, %U A056135 188,3,1,2,204,13,212,6,220,14,228,232,236,15,244,248,7,1,260,264,268,17 %N A056135 Smallest positive integer other than n where geometric mean of n and a(n) is an integer. %F A056135 a(n)=A056134(n)^2/n. If n is squarefree then a(n)=4n, otherwise a(n)=A007913(n) %K A056135 easy,nonn %O A056135 1,1 %A A056135 _Henry Bottomley_, Jun 13 2000