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A062702
Index of factorial primes of form m!-1.
1
3, 9, 128, 675, 25306287, 3610490805
OFFSET
1,1
FORMULA
a(n) = PrimePi(A002982(n)!-1) = A000720(A055490(n)).
EXAMPLE
The exact subscript of 7th prime [=30!-1=265252859812191058636308479999999] is not yet available.
CROSSREFS
KEYWORD
hard,nonn
AUTHOR
Labos Elemer, Jul 11 2001
EXTENSIONS
Offset 1 from Michel Marcus, Aug 29 2019
STATUS
approved