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 A251238 #6 Dec 10 2014 17:52:46 %S A251238 1,3,5,7,9,11,13,15,17,19,21,22,23,24,26,28,30,32,34,36,38,40,42,43, %T A251238 45,47,49,51,53,55,57,59,61,62,64,66,68,70,72,74,76,78,79,81,83,85,87, %U A251238 88,90,92,94,96,98,100,101,103,105,107,109,111,113,114,116 %N A251238 Indices of odd numbers in A098550. %C A251238 A098550(a(n)) mod 2 = 1. %H A251238 Reinhard Zumkeller, <a href="/A251238/b251238.txt">Table of n, a(n) for n = 1..10000</a> %o A251238 (Haskell) %o A251238 a251238 n = a251238_list !! (n-1) %o A251238 a251238_list = filter (odd . a098550) [1..] %Y A251238 Cf. A098550, A005408, A251237, A251239. %K A251238 nonn %O A251238 1,2 %A A251238 _Reinhard Zumkeller_, Dec 02 2014