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A172998
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Numbers n such that 10^4n + 10^3n - 10^n - 3 is prime.
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1
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OFFSET
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1,2
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COMMENTS
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Corresponds to the numbers 10987, 100999897, 1000999998997, 10000999999989997, ...
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LINKS
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MATHEMATICA
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fQ[n_] := PrimeQ[10^(4 n) + 10^(3 n) - 10^n - 3]; k = 1; lst = {}; While[k < 3300, If[ fQ@k, AppendTo[lst, k]]; k++ ]; lst (* Robert G. Wilson v, Feb 15 2010 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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