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 A025664 #7 Jul 06 2025 12:46:47 %S A025664 0,0,0,1,0,1,0,1,0,2,1,0,2,1,0,2,1,0,3,2,1,0,3,2,1,0,3,2,1,0,4,3,2,1, %T A025664 0,4,3,2,1,0,4,3,2,1,0,5,4,3,2,1,0,5,4,3,2,1,0,5,4,3,2,1,6,0,5,4,3,2, %U A025664 1,6,0,5,4,3,2,1,6,0,5,4,3,2,7,1,6,0,5,4,3,2,7,1,6,0,5,4,3,2,7,1,6,0,5,4,3,8,2,7 %N A025664 Exponent of 7 (value of j) in n-th number of form 2^i*7^j. %Y A025664 Cf. A003591. %K A025664 nonn %O A025664 1,10 %A A025664 _David W. Wilson_