%I #5 Mar 31 2012 10:26:16
%S 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 100,105,110,115,120,0,0,125,130,135,140,145,0,150,155,160,165,170,0,
%U 175,180,185,190,195,0,200,205,210,215,220,0,225,230,235,240,245,0,0,250
%N Smallest number m such that m! ends in exactly n trailing 0's (or 0 if no such m exists).
%C The sequence locates the first occurrence of n in A027868.
%C Entries are zero if n is an element of A000966.
%F a(n) = 5*A181578(n).
%Y Cf. A181578
%K nonn
%O 0,2
%A _Lekraj Beedassy_, Nov 02 2010