%I #9 Jan 27 2015 01:03:00
%S 1,1,2,1,1,1,2,1,2,1,3,2,1,1,1,1,1,1,1,1,2,2,3,1,2,3,1,2,3,1,3,1,3,1,
%T 3,1,1,2,1,3,2,1,3,2,1,1,3,2,1,1,1,3,2,2,2,1,1,1,1,1,1,1,1,3,3,1,1,1,
%U 1,1,1,1,1,1,2,2,3,3,1,1,1,2,2,3,1,1,2,2,1,1,1,2,1,1,2,3,1,1,2,1
%N a(n) = leading digit of n! in base 4.
%t f[n_]:=First[IntegerDigits[n!,4]]; lst={};Do[AppendTo[lst,f[n]],{n,0,2*5!}];lst (* _Vladimir Joseph Stephan Orlovsky_, Jun 14 2009 *)
%o (PARI) a(n) = digits(n!, 4)[1]; \\ _Michel Marcus_, Jan 27 2015
%Y Cf. A000142, A136691, A136754, A136756, A136757, A136758, A136759, A136760, A008905, A136761, A136762, A136763, A136764, A136765, A136766.
%K base,easy,nonn
%O 0,3
%A _Carl R. White_, Jan 21 2008
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