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A049433
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Numbers n such that n!-(n-1)!-1 is prime.
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5
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3, 4, 6, 8, 9, 12, 28, 78, 99, 184, 286, 291, 398, 411, 600, 718, 732, 889, 1963, 2240, 2242, 2533, 8800, 11403
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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There is no further term up to 1400. - Farideh Firoozbakht, Jul 18 2003
a(25) > 12000. [From Donovan Johnson, Dec 18 2009]
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LINKS
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Table of n, a(n) for n=1..24.
Index entries for sequences related to factorial numbers
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EXAMPLE
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6!-(6-1)!-1 = 599 is prime.
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CROSSREFS
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Cf. A049432, A049985.
Cf. A001272, A002981, A002982.
Sequence in context: A284469 A059267 A355200 * A250984 A135251 A298809
Adjacent sequences: A049430 A049431 A049432 * A049434 A049435 A049436
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KEYWORD
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nonn
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AUTHOR
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Paul Jobling (paul.jobling(AT)whitecross.com)
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EXTENSIONS
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More terms from Farideh Firoozbakht, Jul 18 2003
Corrected offset, edited definition and a(19)-a(24) from Donovan Johnson, Dec 18 2009
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STATUS
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approved
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