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A135249
a(n) = number of bits in the binary expansion of A046967(n).
1
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.
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
KEYWORD
nonn,easy,base
AUTHOR
Artur Jasinski, Nov 24 2007
EXTENSIONS
More terms from Amiram Eldar, Oct 12 2024
STATUS
approved