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 A194426 #15 Feb 11 2019 08:45:27 %S A194426 45,75,99,153,175,245,261,325,363,369,475,531,539,637,639,833,845,847, %T A194426 867,909,925,963,1075,1127,1183,1233,1341,1519,1573,1611,1675,1719, %U A194426 1773,1805,1813,1859,1975,2009,2023,2043,2151,2299,2303 %N A194426 Elements n of A194234 for which the cototient(n) is not a prime power (A000961). %K A194426 nonn,easy %O A194426 1,1 %A A194426 _Naohiro Nomoto_, Oct 12 2011