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A118812
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Primes of the form (2n)! - n! + 1.
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0
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OFFSET
| 1,1
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EXAMPLE
| n=2 (2*2)! - 2! + 1 = 24 - 2 + 1 = 23
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MAPLE
| PFACT:=proc(N) local i, r; for i from 1 by 1 to N do r:=(2*i)!-i!+1; if isprime(r) then print(i); fi; od; end: PFACT(100);
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CROSSREFS
| Sequence in context: A067837 A089987 A162605 * A054909 A171636 A100816
Adjacent sequences: A118809 A118810 A118811 * A118813 A118814 A118815
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KEYWORD
| nonn
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AUTHOR
| Paolo P. Lava & Giorgio Balzarotti (paoloplava(AT)gmail.com), May 23 2006
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