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A138048
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Numbers k such that 15^k + 2 is prime.
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7
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0, 1, 2, 4, 5, 10, 11, 16, 20, 52, 75, 106, 112, 132, 371, 3264, 3424, 5477, 7516, 10365, 44557, 150706
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OFFSET
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1,3
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COMMENTS
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LINKS
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MATHEMATICA
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Do[ f = 15^n + 2; If[ PrimeQ[ f ], Print[ {n, f} ] ], {n, 1, 371} ]
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PROG
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CROSSREFS
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Cf. A051783 (k such that 3^k + 2 is prime).
Cf. A087885 (k such that 5^k + 2 is 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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a(20) found by Lelio R Paula, Dec 2006
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STATUS
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approved
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