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Search: id:A139466
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| A139466 |
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Smallest prime factor of n! + 2n - 1. |
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+0
4
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| 2, 5, 11, 31, 3, 17, 31, 3, 362897, 3628819, 3, 251, 5, 3, 93407, 200989, 3, 5, 211, 3, 199, 38189, 3, 314707, 7, 3, 2473, 5, 3, 98274048659069, 1447, 3, 5, 585341, 3, 61, 8150209692797, 3, 7, 131
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OFFSET
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1,1
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REFERENCES
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F. Luca and I. E. Shparlinsky, 2005. On the largest prime factor of n! + 2n - 1. J. Th. des Nombres de Bordeaux Vol.17, Fasc. 3
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MATHEMATICA
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a = {}; Do[AppendTo[a, n! + 2 n - 1], {n, 1, 40}]; b = {}; Do[c = FactorInteger[a[[n]]]; d = c[[1]]; AppendTo[b, d[[1]]], {n, 1, Length[a]}]; b (*Artur Jasinski*)
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CROSSREFS
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Cf. A127986, A127987, A139023, A139024, A139464, A139465, A139467.
Sequence in context: A144959 A131347 A079225 this_sequence A139467 A124481 A002862
Adjacent sequences: A139463 A139464 A139465 this_sequence A139467 A139468 A139469
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KEYWORD
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nonn
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Apr 22 2008
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