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%I #4 Dec 15 2017 17:36:50
%S 0,1,3,6,6,9,8,10,12,18,15,16,21,17,20,23,28,33,30,35,34,38,39,39,37,
%T 39,44,47,51,48,50,48,59,62,55,55,56,62,60,64,66,64,68,62,77,76,78,76,
%U 76,73,83,81,86,105,89,94,94,103,97,93,89,90,105,109,105,104,102,106,107
%N Number of 1's in the binary expansion of the repunits.
%e a(3)=6 because 111 = '1101111' has 6 ones.
%Y Cf. A000120, A002275.
%K easy,nonn,base
%O 0,3
%A _Jason Earls_, Jul 11 2005
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