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A096723
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Numbers n such that 3^n has the form 2p-+1 where p is prime.
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1
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1, 2, 3, 4, 7, 13, 16, 32, 64, 71, 103, 541, 1091, 1367, 1627, 4177, 9011, 9551, 36913, 43063, 49681, 57917, 483611, 877843, 2215303, 2704981, 3598867
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OFFSET
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1,2
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COMMENTS
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For the corresponding primes p see A088553.
For n > 1, numbers n such that (3^n + (-1)^n)/2 is prime. - Thomas Ordowski, Dec 26 2016
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LINKS
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MATHEMATICA
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Select[Range[4200], Or@@PrimeQ[(3^#+{1, -1})/2]&] (* Harvey P. Dale, Mar 05 2013 *)
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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