|
%I #7 Aug 29 2019 09:52:50
%S 3,9,128,675,25306287,3610490805
%N Index of factorial primes of form m!-1.
%F a(n) = PrimePi(A002982(n)!-1) = A000720(A055490(n)).
%e The exact subscript of 7th prime [=30!-1=265252859812191058636308479999999] is not yet available.
%Y Cf. A002981, A002982, A055490.
%K hard,nonn
%O 1,1
%A _Labos Elemer_, Jul 11 2001
%E Offset 1 from _Michel Marcus_, Aug 29 2019
| 