1,1

The members are the primes in A002982 (n! - 1 is prime).

R. K. Guy, Unsolved Problems in Number Theory, Section A2.

Eric Weisstein's World of Mathematics, Factorial Prime

Index entries for sequences related to factorial numbers.

3 is prime and 3! - 1 = 5 is prime, so 3 is a member.

Cf. A002982.

Adjacent sequences: A103314 A103315 A103316 this_sequence A103318 A103319 A103320

Sequence in context: A088097 A064774 A089689 this_sequence A104051 A128004 A086559

hard,more,nonn

Jonathan Sondow (jsondow(AT)alumni.princeton.edu), Jan 31 2005