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 A051856 Numbers n such that (n!)^2+n!+1 is prime. 6
 0, 1, 2, 3, 4, 6, 76, 2837, 6001, 7076 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 REFERENCES H. Dubner, Factorial and primorial primes, J. Rec. Math., 19 (No. 3) (1987) LINKS Table of n, a(n) for n=1..10. C. K. Caldwell, The Prime Pages C. Nash, Prime Form [broken link] M. Oakes, Re: Gaussian primorial and factorial primes, Primeform, Dec 21 2010 Mike Oakes, Andrew Walker, David Broadhurst, Gaussian primorial and factorial primes, digest of 7 messages in primeform Yahoo group, Dec 20 - Dec 21, 2010. EXAMPLE 6 is in the sequence because (6!)^2+6!+1=519121 is prime. MATHEMATICA Do[If[PrimeQ[n!^2+n!+1], Print[n]], {n, 600}] (* Farideh Firoozbakht, Jul 12 2003 *) CROSSREFS Cf. A002981, A002982, A046029. Sequence in context: A033179 A067244 A084811 * A135236 A029962 A259388 Adjacent sequences: A051853 A051854 A051855 * A051857 A051858 A051859 KEYWORD nonn,hard,more AUTHOR Andrew Walker (ajw01(AT)uow.edu.au), Dec 13 1999 EXTENSIONS Edited by R. J. Mathar, Aug 08 2008 a(8)-a(10) from Serge Batalov, Nov 24 2011 STATUS approved

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Last modified May 21 00:14 EDT 2024. Contains 372720 sequences. (Running on oeis4.)