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A059528
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Numbers k such that (7*3^k + 5)/2 is prime.
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1
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1, 3, 5, 15, 21, 27, 65, 191, 327, 371, 575, 1895, 2375, 2607, 9735
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OFFSET
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1,2
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COMMENTS
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a(16) > 20055. - Jinyuan Wang, Jan 29 2020
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LINKS
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Table of n, a(n) for n=1..15.
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MATHEMATICA
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Do[ If[ PrimeQ[ (7*3^n + 5)/2 ], Print[n] ], {n, 0, 5300} ]
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PROG
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(PARI) is(n)=ispseudoprime((7*3^n+5)/2) \\ Charles R Greathouse IV, Jun 13 2017
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CROSSREFS
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Cf. A059569 ((7*3^k-5)/2 is prime).
Sequence in context: A208854 A165260 A201874 * A070079 A142717 A057742
Adjacent sequences: A059525 A059526 A059527 * A059529 A059530 A059531
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KEYWORD
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nonn,more
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AUTHOR
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Robert G. Wilson v, Feb 16 2001
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EXTENSIONS
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a(15) from Jinyuan Wang, Jan 29 2020
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STATUS
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approved
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