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Search: id:A002582
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| A002582 |
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Largest prime factor of n! - 1.
(Formerly M3925 N1613)
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+0
7
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| 1, 5, 23, 17, 719, 5039, 1753, 2999, 125131, 7853, 479001599, 3593203, 87178291199, 1510259, 6880233439, 256443711677, 478749547, 78143369, 19499250680671, 4826713612027, 170006681813, 498390560021687969
(list; graph; listen)
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OFFSET
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2,2
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
A. Borning, Some results for k!+-1 and 2.3.5...p+-1, Math. Comp., 26 (1972), 567-570.
M. Kraitchik, On the divisibility of factorials, Scripta Math., 14 (1948), 24-26 (but beware errors).
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LINKS
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Hisanori Mishima, Factorizations of many number sequences
Hisanori Mishima, Factorizations of many number sequences
R. G. Wilson v, Explicit factorizations
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MATHEMATICA
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Do[ Print[ FactorInteger[ n! - 1, FactorComplete -> True ][ [ -1, 1 ] ] ], {n, 3, 32} ]
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CROSSREFS
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Cf. A002583, A033312, A054415, A056110.
Sequence in context: A156328 A078190 A081319 this_sequence A102723 A136146 A167804
Adjacent sequences: A002579 A002580 A002581 this_sequence A002583 A002584 A002585
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KEYWORD
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nonn,nice,easy
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Aug 01 2000
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