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 A025745 #7 Jul 06 2025 14:34:27 %S A025745 1,3,6,10,15,21,29,38,48,59,71,85,100,116,133,151,170,191,213,236,260, %T A025745 285,312,340,369,399,430,462,496,531,567,604,642,682,723,765,808,852, %U A025745 897,944,992,1041,1091,1142,1195,1249,1304,1360,1417,1475,1535,1596,1658 %N A025745 Index of 10^n within sequence of numbers of form 7^i*10^j. %C A025745 Positions of zeros in A025671. - _R. J. Mathar_, Jul 06 2025 %K A025745 nonn %O A025745 1,2 %A A025745 _David W. Wilson_