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 A025698 #7 Jul 06 2025 13:50:13 %S A025698 1,2,4,6,9,12,16,20,25,31,37,44,51,59,67,76,86,96,107,118,130,142,155, %T A025698 168,182,197,212,228,244,261,278,296,315,334,354,374,395,416,438,461, %U A025698 484,508,532,557,582,608,634,661,689,717,746,775,805,835,866,898,930,963,996 %N A025698 Index of 3^n within sequence of numbers of form 3^i*7^j. %C A025698 Positions of zeros in A025665. - _R. J. Mathar_, Jul 06 2025 %K A025698 nonn %O A025698 1,2 %A A025698 _David W. Wilson_