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A181987
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Numbers n such that (39^n - 1)/38 is prime.
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1
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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Select[Prime[Range[100000]], PrimeQ[(39^#-1)/38]&]
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PROG
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CROSSREFS
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Cf. A028491, A004061, A004062, A004063, A004023, A005808, A004064, A016054, A006032, A006033, A006034, A006035, A127995, A127996, A127997, A127998, A127999, A098438, A128002, A128003, A128004, A128005.
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KEYWORD
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hard,more,nonn
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AUTHOR
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STATUS
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approved
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