OFFSET
1,1
LINKS
Harry J. Smith, Table of n, a(n) for n=1,...,15
MATHEMATICA
lst={}; Do[p=3*n!+1; If[PrimeQ[p], AppendTo[lst, p]], {n, 0, 5!}]; lst (* Vladimir Joseph Stephan Orlovsky, Jan 28 2009 *)
Select[3*Range[40]! +1, PrimeQ] (* Harvey P. Dale, Jul 20 2018 *)
PROG
(PARI) for(n=1, 40, if(isprime(3*n!+1), print(3*n!+1)))
(PARI) { n=0; for (m=0, 10^5, if(isprime(a=3*m! + 1), write("b062551.txt", n++, " ", a); if (n==15, break)) ) } \\ Harry J. Smith, Aug 08 2009
CROSSREFS
KEYWORD
nonn
AUTHOR
Jason Earls, Jul 10 2001
STATUS
approved