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A217131
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Numbers n such that 7^n - 8 is prime.
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10
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2, 4, 8, 10, 50, 106, 182, 293, 964, 1108, 1654, 1756, 4601, 8870, 15100, 17446, 22742, 34570, 50150, 95276
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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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MATHEMATICA
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Select[Range[1, 5000], PrimeQ[7^# - 8] &]
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PROG
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(PARI) for(n=1, 5*10^3, if(isprime(7^n-8), print1(n, ", ")))
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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