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 A249575 #17 Nov 04 2014 06:15:02 %S A249575 1,2,3,4,5,6,7,8,9,10,12,13,16,17,19,21,22,24,27,28,30,31,34,37,41,43, %T A249575 45,51,54,55,58,60,61,67,69,73,76,79,82,83,85,91,93,94,96,97,100,103, %U A249575 106,115,121,124,127,130,133,136,139,142,144,145,151,160,163 %N A249575 Indices of prime powers in A084937. %H A249575 Reinhard Zumkeller, <a href="/A249575/b249575.txt">Table of n, a(n) for n = 1..10000</a> %o A249575 (Haskell) %o A249575 a249575 n = a249575_list !! (n-1) %o A249575 a249575_list = filter ((== 1) . a010055 . a084937) [1..] %Y A249575 Cf. A084937, A249602, A010055. %K A249575 nonn %O A249575 1,2 %A A249575 _Reinhard Zumkeller_, Nov 04 2014