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A219049
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Numbers k such that 3^k - 32 is prime.
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16
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5, 8, 18, 21, 69, 84, 181, 216, 461, 642, 672, 2413, 3681, 5666, 12281, 14949, 19508, 27817, 34061, 43236, 43733, 81828
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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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3^5 - 32 = 211 (prime), so 5 is in the sequence.
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MATHEMATICA
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Do[If[PrimeQ[3^n - 32], Print[n]], {n, 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:
(m = 32) A219048, (m = -32) A219049, (m = 34) A219050, (m = -34) A219051. 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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