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RosettaCodeData/Task/Long-primes/Mathematica/long-primes.math

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lPrimes[n_] := Select[Range[2, n], Length[RealDigits[1/#][[1, 1]]] == # - 1 &];
lPrimes[500]
Length /@ lPrimes /@ ( 250*2^Range[8])
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