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A046029
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Numbers n such that (n!)^2+1 is prime.
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18
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0, 1, 2, 3, 4, 5, 9, 10, 11, 13, 24, 65, 76
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| a(14) > 780. - Ralf Stephan (ralf(AT)ark.in-berlin.de), Oct 21 2002
a(14) > 2500. - Gabriel Cunningham (gcasey(AT)mit.edu), Feb 23 2004
a(14) > 10000. - Charles R Greathouse IV, Nov 16 2006
a(14) > 16000
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REFERENCES
| H. Ibstedt, A Few Smarandache Sequences, Smarandache Notions Journal, Vol. 8, No. 1-2-3, 1997, 170-183.
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LINKS
| M. Oakes, Re: Gaussian primorial and factorial primes, Primeform, Dec 21 2010
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
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EXAMPLE
| 9 is a term because (9!)^2 + 1 is prime.
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MATHEMATICA
| Do[ If[ PrimeQ[n!^2 + 1], Print[n]], {n, 500}] (from Robert G. Wilson v Apr 14 2004)
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CROSSREFS
| Cf. A020549, A051739.
Sequence in context: A095906 A118732 A118872 * A139456 A194410 A081869
Adjacent sequences: A046026 A046027 A046028 * A046030 A046031 A046032
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KEYWORD
| nonn,more
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AUTHOR
| Eric Weisstein (eric(AT)weisstein.com)
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