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 A025743 #7 Jul 06 2025 14:31:44 %S A025743 1,3,6,11,17,25,34,45,57,70,85,101,119,138,159,181,204,229,255,283, %T A025743 312,343,375,408,443,479,517,556,597,639,682,727,773,821,870,921,973, %U A025743 1026,1081,1137,1195,1254,1315,1377,1440,1505,1571,1639,1708,1779,1851,1924 %N A025743 Index of 10^n within sequence of numbers of form 5^i*10^j. %C A025743 Positions of zeros in A025655. - _R. J. Mathar_, Jul 06 2025 %K A025743 nonn %O A025743 1,2 %A A025743 _David W. Wilson_