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A093795
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Numbers k such that 9^k + 8^(k-1) is prime.
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20
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2, 7, 8, 31, 610, 1292, 4015, 5990, 8887, 9626, 57952, 62116, 84698
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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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8 is a term since 9^8 + 8^7 = 45143873, which is a prime number.
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MATHEMATICA
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Do[ If[ PrimeQ[9^n + 8^(n - 1)], Print[n]], {n, 4000}]
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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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Herman H. Rosenfeld (herm3(AT)pacbell.net), May 18 2004
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EXTENSIONS
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STATUS
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approved
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