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 A181579 #5 Mar 31 2012 10:26:16 %S A181579 0,5,10,15,20,0,25,30,35,40,45,0,50,55,60,65,70,0,75,80,85,90,95,0, %T A181579 100,105,110,115,120,0,0,125,130,135,140,145,0,150,155,160,165,170,0, %U A181579 175,180,185,190,195,0,200,205,210,215,220,0,225,230,235,240,245,0,0,250 %N A181579 Smallest number m such that m! ends in exactly n trailing 0's (or 0 if no such m exists). %C A181579 The sequence locates the first occurrence of n in A027868. %C A181579 Entries are zero if n is an element of A000966. %F A181579 a(n) = 5*A181578(n). %Y A181579 Cf. A181578 %K A181579 nonn %O A181579 0,2 %A A181579 _Lekraj Beedassy_, Nov 02 2010