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Search: id:A082400
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| A082400 |
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Numbers n such that 2^n+3^(n-1) is prime. |
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+0
1
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| 1, 2, 3, 4, 5, 6, 7, 10, 12, 13, 16, 18, 23, 33, 34, 36, 37, 47, 48, 60, 64, 81, 102, 155, 160, 174, 222, 226, 237, 251, 282, 348, 790, 993, 1608, 1632, 1984, 2073, 3617, 3703, 5077, 5958, 6336, 8772
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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n=5: it gives 32+81=113 prime.
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MATHEMATICA
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Do[p = 2^n + 3^(n-1); If[PrimeQ[p], Print[n]], {n, 1, 10^4}] (Propper)
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CROSSREFS
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Sequence in context: A080571 A165805 A165722 this_sequence A072993 A018444 A032378
Adjacent sequences: A082397 A082398 A082399 this_sequence A082401 A082402 A082403
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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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8 more terms from Ryan Propper (rpropper(AT)stanford.edu), Jul 23 2005
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