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 A025735 #7 Jul 06 2025 14:25:16 %S A025735 1,3,6,11,17,24,33,43,54,67,81,97,114,132,152,173,195,219,244,270,298, %T A025735 327,358,390,423,458,494,531,570,610,651,694,738,784,831,879,929,980, %U A025735 1032,1086,1141,1197,1255,1314,1375,1437,1500,1565,1631,1698,1767,1837 %N A025735 Index of 9^n within sequence of numbers of form 5^i*9^j. %C A025735 Positions of zeros in A025654. - _R. J. Mathar_, Jul 06 2025 %K A025735 nonn %O A025735 1,2 %A A025735 _David W. Wilson_