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A079906
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Numbers k such that 5*6^k - 1 is prime.
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15
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1, 2, 6, 7, 11, 23, 33, 48, 68, 79, 116, 151, 205, 1016, 1332, 1448, 3481, 3566, 3665, 11233, 13363, 29166, 44358, 58530, 191706, 386450, 605168, 616879, 1204077
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OFFSET
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1,2
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COMMENTS
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REFERENCES
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R. K. Guy, Unsolved Problems in Theory of Numbers, Section A3.
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LINKS
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MATHEMATICA
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Do[ If[ PrimeQ[5*6^n - 1], Print[n]], {n, 1, 5000}]
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PROG
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(PARI) for(n=1, 2000, if(isprime(5*6^n-1), print1(n, ", ")))
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CROSSREFS
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KEYWORD
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nonn,hard,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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