A051901 Minimal factorial safe-primes: a prime p = a(n) here if (p-1)/n! = A051888(n).

3, 5, 13, 73, 241, 2161, 15121, 282241, 1088641, 10886401, 199584001, 958003201, 18681062401, 1133317785601, 9153720576001, 648606486528001, 1778437140480001, 12804747411456001, 851515702861824001

Offset

1,1

Links

Table of n, a(n) for n=1..19.

Formula

a(n) = 1 + n!*A051888(n) = 1 + A000142(n)*A051888(n).

Example

a(8) = 282241 = 8!*A051888(8) = 40320*7 + 1.

Crossrefs

Cf. A005385, A051888, A000142.

Sequence in context: A347866 A066141 A159293 * A268021 A018928 A239381

Adjacent sequences: A051898 A051899 A051900 * A051902 A051903 A051904

Keyword

nonn

Author

Labos Elemer, Dec 16 1999

Status

approved