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A062701 Index of factorial primes of form n!+1. 1
1, 2, 4, 2428957 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..4.

FORMULA

a(n) = PrimePi(A002981(n)!+1).

EXAMPLE

The exact subscript of 5th prime [1+27!=10888869450418352160768000001] is not yet available.

CROSSREFS

Cf. A002981, A002982, A055490.

Sequence in context: A274990 A079236 A138852 * A252783 A192225 A020821

Adjacent sequences:  A062698 A062699 A062700 * A062702 A062703 A062704

KEYWORD

hard,nonn

AUTHOR

Labos Elemer, Jul 11 2001

EXTENSIONS

Offset 1 from Michel Marcus, Aug 29 2019

STATUS

approved

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Last modified September 28 17:43 EDT 2020. Contains 337393 sequences. (Running on oeis4.)