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 A263258 #5 Nov 09 2015 16:08:25 %S A263258 0,1,3,5,17,21,23,27,29,31,35,39,41,47,51,53,57,59,61,65,69,71,73,77, %T A263258 221,223,231,233,237,239,245,249,261,263,267,269,275,277,287,291,295, %U A263258 299,303,315,317,323,329,331,335,337,345,347,349,357,363,855,857,1073,1077,1085,1087,1095,1097,1101,1111 %N A263258 a(n) = A049820(A263257(n)). %C A263258 Sequence is strictly increasing. %H A263258 Antti Karttunen, <a href="/A263258/b263258.txt">Table of n, a(n) for n = 1..1835</a> %F A263258 a(n) = A049820(A263257(n)). %o A263258 (Scheme) (define (A263258 n) (A049820 (A263257 n))) %Y A263258 Cf. A049820, A263257. %K A263258 nonn %O A263258 1,3 %A A263258 _Antti Karttunen_, Nov 07 2015