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A272345
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Numbers n such that 8^n-7^(n-1) is prime.
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1
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1, 3, 5, 29, 41, 83, 471, 725, 1277, 10271, 15069, 97731
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OFFSET
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1,2
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COMMENTS
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a(13) > 10^5.
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LINKS
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EXAMPLE
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5 is a member since 8^5 - 7^4 = 32768 - 2401 = 30367 which is a prime number.
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MATHEMATICA
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Select[Range[0, 100000], PrimeQ[8^# - 7^(# - 1)] &]
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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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STATUS
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approved
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