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%I #4 Jul 15 2014 10:18:06
%S 0,1,2,3,3,4,5,5,6,7,6,7,8,8,9,10,10,11,12,11,12,13,13,14,15,15,16,17,
%T 15,16,17,17,18,19,19,20,21,20,21,22,22,23,24,24,25,26,25,26,27,27,28,
%U 29,29,30,31,29,30,31,31,32,33,33,34,35,34,35,36,36
%N a(n)=log_3(A131137(n)).
%o (PARI) a(n)=if(n<4,n,valuation(denominator(polylog(1-n,1/4)/4),3)) \\ _Charles R Greathouse IV_, Jul 15 2014
%K easy,nonn
%O 0,3
%A _Paul Barry_, Jun 17 2007
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