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A219039
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Numbers k such that 3^k - 16 is prime.
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16
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3, 5, 11, 15, 51, 69, 99, 227, 381, 537, 9135, 9737, 58437, 105567, 121779, 123645
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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For k = 3, 3^3 - 16 = 11 and 11 is prime. Hence k = 3 is included in the sequence.
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MATHEMATICA
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Do[If[PrimeQ[3^n - 16], Print[n]], {n, 1, 10000}]
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PROG
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CROSSREFS
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Cf. Sequences of numbers k such that 3^k + m is prime:
Note that if m is a multiple of 3, 3^k + m is also a multiple of 3 (for k greater than 0), and as such isn't prime.
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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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