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Search: id:A127986
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| A127986 |
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Numbers of the form n! + 2^n - 1. |
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+0
9
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| 2, 5, 13, 39, 151, 783, 5167, 40575, 363391, 3629823, 39918847, 479005695, 6227028991, 87178307583, 1307674400767, 20922789953535, 355687428227071, 6402373705990143, 121645100409356287, 2432902008177688575
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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F. Luca, 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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LINKS
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Bosma W. On the largest prime factor of n! + 2n - 1.
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FORMULA
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a(n) = n! + 2^n - 1
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MATHEMATICA
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Table[n! + 2^n - 1, {n, 1, 30}] (*Artur Jasinski*)
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PROGRAM
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(Other) sage: [gaussian_binomial(n, 1, 2)+factorial(n) for n in xrange(1, 21)] # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 29 2009]
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CROSSREFS
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Cf. A127986.
Sequence in context: A149861 A148305 A104447 this_sequence A133448 A149862 A149863
Adjacent sequences: A127983 A127984 A127985 this_sequence A127987 A127988 A127989
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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), Feb 09 2007
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