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 A025701 #7 Jul 06 2025 13:55:11 %S A025701 1,3,6,10,16,23,31,40,51,63,76,90,106,123,141,160,181,203,226,250,276, %T A025701 303,331,361,392,424,457,492,528,565,603,643,684,726,769,814,860,907, %U A025701 955,1005,1056,1108,1161,1216,1272,1329,1388,1448,1509,1571,1635,1700,1766 %N A025701 Index of 4^n within sequence of numbers of form 3^i*4^j. %C A025701 Positions of zeros in A025640. - _R. J. Mathar_, Jul 06 2025 %K A025701 nonn %O A025701 1,2 %A A025701 _David W. Wilson_