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 A025691 #7 Jul 06 2025 12:39:32 %S A025691 0,0,1,0,1,2,0,1,2,3,0,1,2,3,4,0,1,2,3,4,5,0,1,2,3,4,5,6,0,1,2,3,4,5, %T A025691 6,7,0,1,2,3,4,5,6,7,8,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,10,0,1, %U A025691 2,3,4,5,6,7,8,9,10,11,0,1,2,3,4,5,6,7,8,9,10,11,12,0,1,2,3,4,5,6,7,8,9,10,11 %N A025691 Exponent of 10 (value of j) in n-th number of form 9^i*10^j. %Y A025691 Cf. A025635. Differs from A002262 at a(253). %K A025691 nonn %O A025691 1,6 %A A025691 _David W. Wilson_