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Sum of binary digits ( = sum of ternary digits ) of terms in A037301.
1

%I #5 Feb 06 2019 15:46:54

%S 0,1,2,3,2,3,2,3,2,3,3,2,3,4,5,4,5,4,5,4,4,4,5,4,5,4,5,4,5,4,5,4,5,4,

%T 5,4,5,6,7,3,3,4,5,5,4,5,4,5,4,5,5,6,7,4,4,5,5,5,4,5,5,4,5,6,7,5,7,6,

%U 4,5,4,5,6,7,6,7,6,7,6,7,7,7,6,4,5,4,5,6,7,4,5,5,6,7,6,7,6,7,5,5,7,4,5,6,6

%N Sum of binary digits ( = sum of ternary digits ) of terms in A037301.

%H G. C. Greubel, <a href="/A178620/b178620.txt">Table of n, a(n) for n = 0..10000</a>

%t s = {}; Do[id3 = IntegerDigits[n, 3]; id2 = IntegerDigits[n, 2];

%t If[(t = Total[id2]) == Total[id3], AppendTo[s, t]], {n, 0, 10^3}]; s

%Y Cf. A037301 (sum of base 2 digits of n) = (sum of base 3 digits of n).

%K base,nonn

%O 0,3

%A _Zak Seidov_, May 31 2010