A108180 - OEIS

A108180

Numbers n such that n^n * (n!/n#) + 1 is prime, where n# = primorial numbers (A034386).

1, 2, 8, 20, 23, 55, 57, 58, 181, 741, 939

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OFFSET

1,2

COMMENTS

n!/n# is known as n compositorial. All values have been proved prime. No more terms up to 3200.

LINKS

CROSSREFS

KEYWORD

more,nonn

AUTHOR

Jason Earls, Jul 24 2005

STATUS

approved