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 A025739 #7 Jul 06 2025 13:41:45 %S A025739 1,2,4,7,11,16,22,29,37,46,56,67,79,92,106,121,137,154,172,191,211, %T A025739 232,253,275,298,322,347,373,400,428,457,487,518,550,583,617,652,688, %U A025739 725,763,802,842,883,925,967,1010,1054,1099,1145,1192,1240,1289,1339,1390,1442 %N A025739 Index of 9^n within sequence of numbers of form 9^i*10^j. %C A025739 Positions of zeros in A025691. - _R. J. Mathar_, Jul 06 2025 %K A025739 nonn %O A025739 1,2 %A A025739 _David W. Wilson_