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A093793
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Numbers n such that 5^n+4^(n-1) is prime.
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19
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2, 6, 22, 94, 622, 910, 1058, 1306, 4430, 18914, 23654, 35630, 52846, 63498, 85630
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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22 is a member since 522+421 = 2388583837526729 which is a prime number.
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MATHEMATICA
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Do[ If[ PrimeQ[5^n + 4^(n - 1)], Print[n]], {n, 5000}]
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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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