OFFSET
1,2
COMMENTS
Corresponding primes of the form n!*3^n - 1 are a(n)!*3^a(n) - 1 ={2,17,254561089305599,8483004771271882804592639999,...}.
a(17) > 25000. - Robert Price, Jul 22 2013
MATHEMATICA
Do[f=n!*3^n-1; If[PrimeQ[f], Print[{n, f}]], {n, 1, 25000}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Alexander Adamchuk, Sep 10 2006
EXTENSIONS
a(12)-a(16) from Robert Price, Jul 22 2013
STATUS
approved