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Search: id:A119573
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| A119573 |
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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. |
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+0
1
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OFFSET
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1,1
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MATHEMATICA
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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]}]]
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CROSSREFS
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Cf. A019434.
Sequence in context: A037155 A038944 A124081 this_sequence A001366 A093329 A111052
Adjacent sequences: A119570 A119571 A119572 this_sequence A119574 A119575 A119576
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KEYWORD
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nonn
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AUTHOR
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Roger L. Bagula (rlbagulatftn(AT)yahoo.com), May 31 2006
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EXTENSIONS
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Edited by N. J. A. Sloane (njas(AT)research.att.com), Jun 03 2006
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