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 A025672 #30 Oct 30 2023 11:04:55 %S A025672 0,0,1,0,1,0,2,1,0,2,1,0,3,2,1,0,3,2,1,0,4,3,2,1,0,4,3,2,1,0,5,4,3,2, %T A025672 1,0,5,4,3,2,1,0,6,5,4,3,2,1,0,6,5,4,3,2,1,0,7,6,5,4,3,2,1,0,7,6,5,4, %U A025672 3,2,1,0,8,7,6,5,4,3,2,1,0,8,7,6,5,4,3,2,1,0,9,8,7,6,5,4,3,2,1,0,9,8,7,6,5,4,3,2 %N A025672 Exponent of 8 (value of j) in n-th number of form 3^i*8^j. %H A025672 Sean A. Irvine, <a href="/A025672/b025672.txt">Table of n, a(n) for n = 1..10000</a> %H A025672 Sean A. Irvine, <a href="/A025672/a025672.txt">Table of n, a(n) for n = 1..981730</a> [a large file] %H A025672 OEIS server, <a href="/A025672/a025672.png">Scatterplot of n, a(n) with n=1..10^6</a>. %F A025672 a(n) = valuation(A025615(n),8) = valuation(A025615(n),2)/3 = A007814(A025615(n))/3. - _M. F. Hasler_, Feb 20 2012 %o A025672 (PARI) A025672(n)=valuation(A025615(n),8) \\ _M. F. Hasler_, Feb 20 2012 %o A025672 (PARI) for(n=1,1e9,n==8^valuation(n,8)*3^valuation(n,3)&&print1(valuation(n,8),", ")) \\ _M. F. Hasler_, Feb 20 2012 %K A025672 nonn %O A025672 1,7 %A A025672 _David W. Wilson_ %E A025672 Incorrect formula deleted by _Sean A. Irvine_, Feb 20 2012