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Search: id:A093452
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| A093452 |
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Numbers n such that 3^n+2^(n-1) is prime. |
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+0
9
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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
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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15 is a member since 315+214 = 14365291 which is a prime number.
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MATHEMATICA
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Do[ If[ PrimeQ[3^n + 2^(n - 1)], Print[n]], {n, 5000}] (from Robert G. Wilson v Jun 17 2004)
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CROSSREFS
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Cf. A095906, A093717, A093793, A093765, A096185, A093794, A093795, A096186.
Adjacent sequences: A093449 A093450 A093451 this_sequence A093453 A093454 A093455
Sequence in context: A065609 A080389 A091199 this_sequence A082103 A051602 A052499
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KEYWORD
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nonn
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AUTHOR
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Herman H. Rosenfeld (herm3(AT)pacbell.net), May 13 2004
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 18 2004
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