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 A057925 #13 Feb 25 2015 17:57:43 %S A057925 2,1,3,6,9,15,27,36,51,87,135,243,315,531,735,969,1707,2679,3831,6363, %T A057925 9663,14559,23091,33045,45999,77523,120471,177639,252717,405321, %U A057925 554037,795831,1335087,1819527,2491233,4183467,5920215,8051991,12530967 %N A057925 Position of first occurrence of 2^n in A057923. %Y A057925 Cf. A057923, A057924. %K A057925 easy,nonn %O A057925 0,1 %A A057925 Larry Reeves (larryr(AT)acm.org), Oct 03 2000 %E A057925 More terms from _David W. Wilson_, Jan 11 2001 %E A057925 Definition corrected by _Michel Marcus_, Aug 02 2013