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%I #19 Jul 27 2023 09:48:40
%S 1,1,1,2,1,1,2,1,2,2,1,3,1,1,2,2,2,3,1,2,1,3,2,2,2,3,1,2,2,3,2,3,2,4,
%T 1,3,3,1,3,2,1,4,1,1,2,2,2,3,2,2,3,3,2,3,3,3,4,2,4,1,2,2,3,1,3,2,3,2,
%U 4,2,3,3,2,4,2,4,3,3,3,4,1,2,5,1,3,2,1,3,3,3,4,2,2,2,3,3,4,2,2,3,4,3,5,1,4
%N Number of ones in binary representation of A137671(n).
%H Reinhard Zumkeller, <a href="/A137672/b137672.txt">Table of n, a(n) for n = 1..10000</a>
%F a(n) = A000120(A137671(n)).
%F a(A137674(n)) = 1.
%F a(A137674(n)-1) = n-1.
%t b[1] = 1; b[n_] := b[n] = Count[Array[a, n-1], a[n-1]]; a[n_] := a[n] = DigitCount[b[n], 2, 1]; Array[a, 100] (* _Amiram Eldar_, Jul 27 2023 *)
%Y Cf. A000120, A137671, A137674.
%K nonn,base
%O 1,4
%A _Reinhard Zumkeller_, Feb 05 2008
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