A121931 Numbers n such that (n!)^8 + 1 is prime.

0, 1, 2, 58, 75, 347

Offset

1,3

Comments

Corresponding primes of the form (n!)^8 + 1 are {2,2,257,...}.

a(7) > 7000. - Robert Price, Aug 26 2014

Links

Table of n, a(n) for n=1..6.

Mathematica

Do[f=(n!)^8+1; If[PrimeQ[f], Print[{n, f}]], {n, 1, 75}]

Crossrefs

Cf. A060890, A051855, A046029, A002981.

Sequence in context: A359242 A090743 A104494 * A343578 A156507 A285148

Adjacent sequences: A121928 A121929 A121930 * A121932 A121933 A121934

Keyword

more,nonn,hard

Author

Alexander Adamchuk, Sep 10 2006

Extensions

347 from Ryan Propper, Jan 03 2008

Status

approved