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 A244747 #11 Oct 09 2022 09:42:43 %S A244747 1,2,3,5,6,9,12,17,29,45,48,81,105,108,177,245,323,324,569,648,893, %T A244747 1277,1296,2121,2592,3221,4853,5184,7697,11015,15333,15552,25841, %U A244747 31104,40157,59213,84239,93312,135107,184679,265277,279936,445029,606509,830411,839808 %N A244747 Positions at which powers of 2 occur in A051145. %C A244747 A209229(A051145(a(n))) = 1; %C A244747 the definition of this sequence was the original definition of A051147. %H A244747 Rémy Sigrist, <a href="/A244747/a244747_1.txt">C++ program</a> %o A244747 (Haskell) %o A244747 import Data.List (findIndices) %o A244747 a244747 n = a244747_list !! (n-1) %o A244747 a244747_list = findIndices ((== 1) . a209229) a051145_list %o A244747 (C++) %o A244747 See Links section. %Y A244747 Cf. A209229, A051147 (subsequence). %K A244747 nonn %O A244747 1,2 %A A244747 _Reinhard Zumkeller_, Jul 05 2014 %E A244747 More terms from _Rémy Sigrist_, Oct 09 2022