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 A127035 #4 Sep 04 2015 10:24:46 %S A127035 0,0,0,1,1,2,3,4,4,5,6,7,8,9,10,11,13,14,15,16,17,18,20,21,22,23,25, %T A127035 26,27,29,30,31,33,34,35,37,38,40,41,43,44,45,47,48,50,51,53,54,56,57, %U A127035 59,60,62,64,65,67,68,70,71,73 %N A127035 Maximal value of m such that 13^m <= n! : a(n) = floor( log(n!) / log(13) ). %o A127035 (PARI) a(n)=lngamma(n+1)\log(13) \\ _Charles R Greathouse IV_, Sep 04 2015 %o A127035 (PARI) a(n)=logint(n!,13) \\ _Charles R Greathouse IV_, Sep 04 2015 %Y A127035 Cf. A067850, A127031, A127032, A127033, A127034, A127035, A127036, A127037, A127039. %K A127035 nonn %O A127035 1,6 %A A127035 _Artur Jasinski_, Jan 03 2007