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A093713
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Numbers k such that 6^k - 5^(k-1) is prime.
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15
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1, 2, 3, 4, 5, 12, 16, 18, 21, 42, 66, 69, 123, 132, 165, 204, 397, 401, 486, 657, 1005, 1050, 1882, 2545, 2813, 3168, 4092, 4151, 4469, 5358, 9168, 11554, 11866, 80946
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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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MATHEMATICA
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Do[ If[ PrimeQ[6^n - 5^(n - 1)], Print[n]], {n, 2000}]
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PROG
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CROSSREFS
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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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