OFFSET
1,1
COMMENTS
Primes 6217 and 13537 are such that p!-2^p+1 is (probably) prime. - M. F. Hasler, Apr 09 2015
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[Prime[Range[2600]], MemberQ[{56}, Mod[#, 61]] &] (* Vincenzo Librandi, Sep 05 2012 *)
Select[Range[56, 21000, 61], PrimeQ] (* Harvey P. Dale, Feb 21 2024 *)
PROG
(Magma) [p: p in PrimesUpTo(21000) | p mod 61 eq 56 ] ; // Vincenzo Librandi, Sep 05 2012
(PARI) select(p->p%61==56, primes(2000)) \\ M. F. Hasler, Apr 09 2015
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Jul 11 2008
STATUS
approved