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 A025669 #7 Jul 06 2025 14:18:29 %S A025669 0,1,0,2,1,0,3,2,1,0,4,3,2,1,0,5,4,3,2,1,0,6,5,4,3,2,1,0,7,6,5,4,3,2, %T A025669 1,0,8,7,6,5,4,3,2,1,0,9,8,7,6,5,4,3,2,1,0,10,9,8,7,6,5,4,3,2,1,0,11, %U A025669 10,9,8,7,6,5,4,3,2,1,0,12,11,10,9,8,7,6,5,4,3,2,1,0,13,12,11,10,9,8,7,6,5,4,3 %N A025669 Exponent of 7 (value of i) in n-th number of form 7^i*8^j. %Y A025669 Cf. A036566. Differs from A025581 at a(136). %K A025669 nonn %O A025669 1,4 %A A025669 _David W. Wilson_