OFFSET
1,1
COMMENTS
a(21) > 12000. [From Donovan Johnson, Dec 18 2009]
EXAMPLE
6!-(6-1)!+1 = 601 is prime.
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul Jobling (paul.jobling(AT)whitecross.com)
EXTENSIONS
More terms from Farideh Firoozbakht, Jul 18 2003
a(17)-a(20) from Donovan Johnson, Dec 18 2009
STATUS
approved