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A062657
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Numbers k such that 91^k - 90^k is prime.
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0
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OFFSET
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1,1
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COMMENTS
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Terms greater than 1000 are often only strong pseudoprimes.
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LINKS
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MATHEMATICA
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Select[Range[0, 100000], PrimeQ[91^# - 90^#] &] (* Robert Price, Ju1 21 2015 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,hard
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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