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Search: id:A055490
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| A055490 |
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Primes of the form n!-1. |
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8
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| 5, 23, 719, 5039, 479001599, 87178291199, 265252859812191058636308479999999, 263130836933693530167218012159999999, 8683317618811886495518194401279999999
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Also primes of the form [(n!-1) mod (n-1)! ], with n>=1. - Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), Mar 14 2007. [For (n!-1) mod (n-1)! only produces numbers of
Also primes of the form 1*1! + 2*2! + ... + n*n!. Example: 1*1! + 2*2! + 3*3! + 4*4! + 5*5! + 6*6! + 7*7! + 8*8! + 9*9! + 10*10! + 11*11! + 12*12! + 13*13! = 87178291199 is prime. - Jonathan Vos Post (jvospost3(AT)gmail.com), Jul 21 2006
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..12
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FORMULA
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p = n!-1 for some n given in A002982
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MATHEMATICA
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lst={}; Do[p=n!-1; If[PrimeQ[p], AppendTo[lst, p]], {n, 0, 5*5!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Jan 27 2009]
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CROSSREFS
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Cf. A002982, A000203.
Sequence in context: A018899 A080990 A003487 this_sequence A002811 A120660 A110720
Adjacent sequences: A055487 A055488 A055489 this_sequence A055491 A055492 A055493
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Jun 28 2000
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