A135249 - OEIS

%I #14 Mar 03 2026 10:17:07

%S 2,4,16,106,1156,15016,255256,4849846,111546436,3234846616,

%T 100280245066,3710369067406,152125131763606,6541380665835016,

%U 307444891294245706,16294579238595022366,961380175077106319536,58644190679703485491636,3929160775540133527939546,278970415063349480483707696

%N a(n) = number of bits in the binary expansion of A046967(n).

%C All the terms in A046967 are of the form 2^k.

%C Is a(n) = A071554(n)? - _R. J. Mathar_, Mar 03 2026

%F From _Amiram Eldar_, Oct 13 2024: (Start)

%F a(n) = A070939(A046967(n)).

%F a(n) = 1 + log_2(A046967(n)) = 1 + A070826(n). (End)

%t a = {}; c = 2; Do[d = Length[IntegerDigits[c, 2]]; c = c^Prime[n]; AppendTo[a, d], {n, 2, 9}]; a

%t 1 + FoldList[Times, 1, Prime[Range[2, 20]]] (* _Amiram Eldar_, Oct 12 2024 *)

%Y Cf. A046967, A070826, A070939, A135250.

%K nonn,easy,base

%O 1,1

%A _Artur Jasinski_, Nov 24 2007

%E More terms from _Amiram Eldar_, Oct 12 2024