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 A069029 #17 Aug 21 2024 18:46:43 %S A069029 1,4,16,64,256,4096,16384,65536,1048576,16777216,67108864,268435456, %T A069029 4294967296,17179869184,68719476736,274877906944,70368744177664, %U A069029 281474976710656,1125899906842624,4503599627370496,18014398509481984,72057594037927936,18446744073709551616 %N A069029 Powers of 4 with strictly increasing sum of digits. %H A069029 <a href="/index/Di#divseq">Index to divisibility sequences</a> %Y A069029 Cf. A069027, A069028. %K A069029 nonn,base %O A069029 1,2 %A A069029 _Amarnath Murthy_, Apr 02 2002 %E A069029 More terms from Larry Reeves (larryr(AT)acm.org), Jun 26 2002