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A119573
Primes that have one of the forms 2^(2^n) + 1, 2^(2^n - 1) + 2^(2^(n + 1) - 1) + 1 or (2^(2^n) + 1 + 2^(2^(n + 1) - 1) + 1)/2.
0
3, 5, 7, 11, 17, 73, 137, 257, 65537
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OFFSET
1,1
LINKS
Table of n, a(n) for n=1..9.
MATHEMATICA
a = Union[Flatten[Table[{2^(2^n) + 1, 2^(2^n - 1) + 2^(2^(n + 1) - 1) + 1, (2^(2^n) + 1 + 2^(2^(n + 1) - 1) + 1)/2}, {n, 0, 10}]]] aout = Flatten[Table[If[PrimeQ[a[[n]]], a[[n]], {}], {n, 1, Length[a]}]]
CROSSREFS
Cf.
A019434
.
Sequence in context:
A356751
A038944
A124081
*
A001366
A093329
A246533
Adjacent sequences:
A119570
A119571
A119572
*
A119574
A119575
A119576
KEYWORD
nonn
AUTHOR
Roger L. Bagula
, May 31 2006
EXTENSIONS
Edited by
N. J. A. Sloane
, Jun 03 2006
STATUS
approved
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Last modified September 8 03:40 EDT 2024. Contains 375749 sequences. (Running on oeis4.)