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 A025726 #7 Jul 06 2025 14:13:24 %S A025726 1,2,4,7,11,16,22,29,37,45,54,64,75,87,100,114,129,145,161,178,196, %T A025726 215,235,256,278,301,325,349,374,400,427,455,484,514,545,576,608,641, %U A025726 675,710,746,783,821,860,899,939,980,1022,1065,1109,1154,1200,1247,1294,1342 %N A025726 Index of 7^n within sequence of numbers of form 7^i*9^j. %C A025726 Positions of zeros in A025681. - _R. J. Mathar_, Jul 06 2025 %K A025726 nonn %O A025726 1,2 %A A025726 _David W. Wilson_