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 A248388 #15 Oct 28 2014 11:03:37 %S A248388 3,6,7,13,15,27,28,31,32,40,50,55,57,63,65,82,101,111,112,115,116,127, %T A248388 131,132,165,172,203,204,223,225,231,233,255,263,264,278,331,332,358, %U A248388 407,408,417,447,448,451,455,463,467,511,527,557,661,663,665,717,761 %N A248388 Indices of composite terms in A247665. %H A248388 Russ Cox and N. J. A. Sloane, <a href="/A248388/b248388.txt">Table of n, a(n) for n = 1..19456</a> %Y A248388 Cf. A247665, A248387, A248379, A248390. %K A248388 nonn %O A248388 1,1 %A A248388 _Russ Cox_ and _N. J. A. Sloane_, Oct 16 2014