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Search: id:A082103
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| A082103 |
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Numbers n such that 3^n+2^(n-1) is prime. |
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+0
10
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| 2, 3, 4, 6, 7, 8, 10, 15, 21, 24, 36, 49, 51, 86, 116, 134, 176, 284, 345, 498, 544, 649, 844, 1051, 1171, 1384, 1497, 1514, 1638, 1856, 2860, 2890, 3235, 3584, 4047, 5990
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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n=4: 89=2*2*2+3*3*3*3 is prime.
n=15: 3^15+2^14 = 14365291 is prime.
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MATHEMATICA
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Do[ If[ PrimeQ[3^n + 2^(n - 1)], Print[n]], {n, 7650}] (from Robert G. Wilson v 24 2004)
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CROSSREFS
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Cf. A082101, A082102, A095906, A093717, A093793, A093765, A096185, A093794, A093795, A096186.
Sequence in context: A080389 A091199 A093452 this_sequence A051602 A052499 A104739
Adjacent sequences: A082100 A082101 A082102 this_sequence A082104 A082105 A082106
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Apr 14 2003
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EXTENSIONS
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Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), May 25 2004
Edited by N. J. A. Sloane (njas(AT)research.att.com), Sep 15 2008 at the suggestion of R. J. Mathar
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