A062702 Index of factorial primes of form m!-1.

3, 9, 128, 675, 25306287, 3610490805

Offset: 1

Author

Labos Elemer, Jul 11 2001

Keywords

• hard
• nonn

Examples

			The exact subscript of 7th prime [=30!-1=265252859812191058636308479999999] is not yet available.
		

Crossrefs

Cf. A002981, A002982, A055490.

Formula

a(n) = PrimePi(A002982(n)!-1) = A000720(A055490(n)).

Extensions

Offset 1 from Michel Marcus, Aug 29 2019