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Search: id:A137390
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| A137390 |
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Numbers n for which n!/9 + 1 is prime. |
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+0
35
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| 8, 46, 87, 168, 259, 262, 292, 329, 446, 1056, 3562
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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For primes of the form (9+k!)/9 see A139068
a(10) corrected from 1053 to 1056 by Dmitry Kamenetsky (dkamen(AT)rsise.anu.edu.au), Jul 12 2008
No other n exists, for n<= 6000. - Dimitris Zygiridis (dmzyg70(AT)gmail.com), Jul 25 2008
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EXAMPLE
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a(11) = 3562 because 3562 is the 11th natural number for which k!/9 + 1 is prime. 3562 is the new term.
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MATHEMATICA
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a = {}; Do[If[PrimeQ[(n! + 9)/9], AppendTo[a, n]], {n, 1, 500}]; a
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CROSSREFS
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Cf. A082672, A089085, A089130, A117141, A007749, A139056, A139057, A139058, A139059, A139060, A139061, A139061, A139062, A139063, A139064, A139065, A139066, A020458, A139068, A137390, A139070, A139071, A139072.
Sequence in context: A120044 A002686 A110348 this_sequence A034469 A134114 A071586
Adjacent sequences: A137387 A137388 A137389 this_sequence A137391 A137392 A137393
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KEYWORD
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nonn,more
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AUTHOR
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Artur Jasinski (grafix(AT)csl.pl), Apr 09 2008
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EXTENSIONS
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Edited by N. J. A. Sloane (njas(AT)research.att.com), May 15 2008 at the suggestion of Richard J. Mathar
3562 from Dimitris Zygiridis (dmzyg70(AT)gmail.com), Jul 25 2008
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