%I A002982 M2321
%S A002982 3,4,6,7,12,14,30,32,33,38,94,166,324,379,469,546,974,1963,3507,3610,
%T A002982 6917,21480,34790
%N A002982 Numbers n such that n! - 1 is prime.
%D A002982 A. Borning, Some results for k!+-1 and 2.3.5...p+-1, Math. Comp., 26 
               (1972), 567-570.
%D A002982 J. P. Buhler et al., Primes of the form n!+-1 and 2.3.5....p+-1, Math. 
               Comp., 38 (1982), 639-643.
%D A002982 C. K. Caldwell and Y. Gallot, On the primality of n!+-1 and 2*3*5*...*p+-1, 
               Math. Comp., 71 (2001), 441-448.
%D A002982 J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 166, p. 53, Ellipses, 
               Paris 2008.
%D A002982 R. K. Guy, Unsolved Problems in Number Theory, Section A2.
%D A002982 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%H A002982 Author?, <a href="http://powersum.dhis.org/">Title?</a>
%H A002982 C. K. Caldwell, <a href="http://primes.utm.edu/">The Prime Pages</a>
%H A002982 C. K. Caldwell, <a href="http://www.utm.edu/research/primes/lists/top20/
               PrimorialFactorial.html">Primorial factorial numbers</a>
%H A002982 P. Carmody, <a href="http://83.143.57.194:16384/Factorial/">Factorial 
               Prime Search Progress Pages</a>
%H A002982 R. Ondrejka, <a href="http://www.utm.edu/research/primes/lists/top_ten/
               ">The Top Ten: a Catalogue of Primal Configurations</a>
%H A002982 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               Factorial.html">Link to a section of The World of Mathematics (1).</
               a>
%H A002982 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               FactorialPrime.html">Link to a section of The World of Mathematics 
               (2).</a>
%H A002982 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               IntegerSequencePrimes.html">Integer Sequence Primes</a>
%H A002982 <a href="Sindx_Fa.html#factorial">Index entries for sequences related 
               to factorial numbers</a>
%H A002982 <a href="http://powersum.dnsq.org/">The prime 34790!-1 was discovered 
               by Leon Marchal on May 16, 2002</a>. - Rick L. Shepherd (rshepherd2(AT)hotmail.com), 
               Jul 18 2002
%t A002982 Select[Range[10^3], PrimeQ[ #!-1] &] (from Vladimir Orlovsky (4vladimir(AT)gmail.com), 
               May 01 2008)
%Y A002982 Cf. A002981 (primes of form n!+1).
%Y A002982 Sequence in context: A153883 A033162 A105133 this_sequence A093707 A058639 
               A161001
%Y A002982 Adjacent sequences: A002979 A002980 A002981 this_sequence A002983 A002984 
               A002985
%K A002982 hard,nonn,nice
%O A002982 1,1
%A A002982 N. J. A. Sloane (njas(AT)research.att.com).
%E A002982 21480 sent in by Ken Davis (ken.davis(AT)softwareag.com), Oct 29 2001
%E A002982 Updated Feb 26 2007 by Max Alekseyev, based on progress reported in the 
               Carmody web site.