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 A025671 #7 Jul 06 2025 14:35:32 %S A025671 0,1,0,2,1,0,3,2,1,0,4,3,2,1,0,5,4,3,2,1,0,6,5,4,3,2,1,7,0,6,5,4,3,2, %T A025671 8,1,7,0,6,5,4,3,9,2,8,1,7,0,6,5,4,10,3,9,2,8,1,7,0,6,5,11,4,10,3,9,2, %U A025671 8,1,7,0,6,12,5,11,4,10,3,9,2,8,1,7,13,0,6,12,5,11,4,10,3,9,2,8,14,1,7,13,0,6 %N A025671 Exponent of 7 (value of i) in n-th number of form 7^i*10^j. %Y A025671 Cf. A025632. %K A025671 nonn %O A025671 1,4 %A A025671 _David W. Wilson_