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Search: id:A139467
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| A139467 |
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Largest prime factor of n! + 2n - 1. |
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+0
4
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| 2, 5, 11, 31, 43, 43, 163, 2689, 362897, 3628819, 179, 1908373, 800903, 101341, 13999747, 104099179, 10778406912001, 1300448327, 356961701, 62382102773760001, 10367823077693, 11437176299, 102338720137
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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[k = n! + 2 n - 1; c = First[Last[FactorInteger[k]]]; AppendTo[a, c], {n, 1, 40}]; a (*Artur Jasinski*)
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CROSSREFS
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Cf. A127986, A127987, A139023, A139024, A139464, A139465, A139466.
Sequence in context: A131347 A079225 A139466 this_sequence A124481 A002862 A139464
Adjacent sequences: A139464 A139465 A139466 this_sequence A139468 A139469 A139470
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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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