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Numbers n such that n!-(n-1)!+1 is prime.
5

%I #11 Mar 31 2012 14:40:08

%S 2,3,4,5,6,8,13,20,24,46,59,150,152,198,683,880,1135,1907,6617,10243

%N Numbers n such that n!-(n-1)!+1 is prime.

%C a(21) > 12000. [From _Donovan Johnson_, Dec 18 2009]

%H <a href="/index/Fa#factorial">Index entries for sequences related to factorial numbers</a>

%e 6!-(6-1)!+1 = 601 is prime.

%Y Cf. A049984, A049433.

%K nonn

%O 1,1

%A Paul Jobling (paul.jobling(AT)whitecross.com)

%E More terms from _Farideh Firoozbakht_, Jul 18 2003

%E a(17)-a(20) from _Donovan Johnson_, Dec 18 2009