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A114247
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Number of Fermat pseudoprimes to base 5 less than 10^n.
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6
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1, 1, 5, 20, 73, 248, 745, 1954, 5239, 13837, 36042, 92893
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OFFSET
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1,3
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LINKS
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MATHEMATICA
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Table[Count[Select[Range[2, 10^6], ! PrimeQ[#] && PowerMod[5, # - 1, #] == 1 &], x_ /; x < 10^n], {n, 6}] (* Robert Price, Jun 09 2019 *)
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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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EXTENSIONS
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STATUS
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approved
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