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A059621
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Numbers k such that (5*3^k + 7)/2 is prime.
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1
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1, 3, 7, 9, 19, 27, 57, 69, 163, 175, 357, 379, 3045
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OFFSET
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1,2
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COMMENTS
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a(14) > 30163. - Jinyuan Wang, Jan 28 2020
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LINKS
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Table of n, a(n) for n=1..13.
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MATHEMATICA
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Do[ If[ PrimeQ[ (5*3^n + 7)/2 ], Print[n] ], {n, 0, 10000} ]
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PROG
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(PARI) is(n)=ispseudoprime((5*3^n+7)/2) \\ Charles R Greathouse IV, Jun 13 2017
(Magma) [k: k in [0..1000] | IsPrime((5*3^k + 7) div 2)]; // Jinyuan Wang, Jan 28 2020
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CROSSREFS
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Cf. A059622 ((5*3^k-7)/2 is prime).
Sequence in context: A154508 A073573 A309328 * A034926 A224849 A304128
Adjacent sequences: A059618 A059619 A059620 * A059622 A059623 A059624
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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 19 2001
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STATUS
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approved
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