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A093717
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Numbers n such that 4^n+3^(n-1) is prime.
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19
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1, 2, 3, 4, 6, 8, 10, 12, 15, 19, 27, 30, 32, 34, 43, 48, 51, 72, 88, 106, 906, 963, 1328, 1336, 1611, 1664, 2680, 3122, 3267, 5323, 6499, 7870, 32836, 37846, 38456, 41912, 45238, 51991, 63530, 68704
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OFFSET
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1,2
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COMMENTS
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LINKS
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EXAMPLE
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19 is a member since 4^19 + 3^18 = 2388583837526729, which is a prime number.
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MATHEMATICA
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Select[Range[1000], PrimeQ[4^# + 3^(# - 1)] &]
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PROG
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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Herman H. Rosenfeld (herm3(AT)pacbell.net), May 17 2004
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EXTENSIONS
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STATUS
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approved
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