A135249 a(n) = number of bits in the binary expansion of A046967(n).

2, 4, 16, 106, 1156, 15016, 255256, 4849846, 111546436, 3234846616, 100280245066, 3710369067406, 152125131763606, 6541380665835016, 307444891294245706, 16294579238595022366, 961380175077106319536, 58644190679703485491636, 3929160775540133527939546, 278970415063349480483707696

Offset

1,1

Comments

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

Links

Table of n, a(n) for n=1..20.

Formula

From Amiram Eldar, Oct 13 2024: (Start)

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

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

Mathematica

a = {}; c = 2; Do[d = Length[IntegerDigits[c, 2]]; c = c^Prime[n]; AppendTo[a, d], {n, 2, 9}]; a
1 + FoldList[Times, 1, Prime[Range[2, 20]]] (* Amiram Eldar, Oct 12 2024 *)

Crossrefs

Cf. A046967, A070826, A070939, A135250.

Sequence in context: A066952 A281964 A297009 * A318154 A110365 A047892

Adjacent sequences: A135246 A135247 A135248 * A135250 A135251 A135252

Keyword

nonn,easy,base

Author

Artur Jasinski, Nov 24 2007

Extensions

More terms from Amiram Eldar, Oct 12 2024

Status

approved