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A262375
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Smallest prime factor of 4*n! - 1.
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1
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3, 3, 7, 23, 5, 479, 2879, 19, 17, 569, 14515199, 159667199, 73, 47, 61, 4993, 43, 455999, 409, 1562713, 1249, 59, 50207, 29, 71, 61651424911, 1407512357, 41, 43613, 10839629, 209206253, 47699, 3915930850588639, 12149, 337, 97, 1783, 214872195913, 89, 649849, 8405532131, 997, 53, 73, 59, 34877
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OFFSET
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0,1
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COMMENTS
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The larger terms (conjectured: records) are those whose indices are listed in A099350.
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LINKS
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MATHEMATICA
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PROG
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(Magma) [PrimeDivisors(4*Factorial(n)-1)[1]: n in [0..50]]; // Bruno Berselli, Sep 21 2015
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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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