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%I #8 Mar 31 2012 20:47:20
%S 1,1,1,1,2,1,1,2,3,3,3,3,2,3,4,5,5,5,4,3,5,6,7,5,8,8,6,8,10,10,8,6,7,
%T 8,8,10,7,9,9,10,11,10,9,10,9,11,11,11,11,12,13,13,12,14,10,14,17,15,
%U 13,13,12,15,14,16,15,12,14,15,15,16,15,15,15,16,13,12,16,17,14,20,20,20
%N One-fourth the digital sum of base 5 representations of 2^n.
%e a(19) = 4 because 2^20 = 1048576 = 232023301 (to scale 5) and (2+3+2+0+2+3+3+0+1)/4 = 4
%t a[n_] := 1/4* Module[{aux = IntegerDigits[2^(n + 1), 5]},Sum[aux[[i]], {i, 1, Length[aux]}]] [From _José María Grau Ribas_, Feb 13 2010]
%Y Cf. A000866.
%K nonn,base
%O 2,5
%A _Lekraj Beedassy_, Jun 20 2000
%E More terms from _James A. Sellers_, Jul 04 2000
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