OFFSET
1,1
COMMENTS
a(6), if it exists, is greater than 20000. - Dmitry Kamenetsky, Feb 06 2009
a(7), if it exists, is greater than 300000. - Michael S. Branicky, Sep 30 2024
MATHEMATICA
Select[Prime[Range[1000]], PrimeQ[(2^# + # + 6)]&] (* Vincenzo Librandi, Oct 30 2012 *)
PROG
(Magma) [p: p in PrimesUpTo(1000)| IsPrime(2^p + p +6)]; // Vincenzo Librandi, Oct 30 2012
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Vincenzo Librandi, Jan 27 2009
EXTENSIONS
a(5) from Dmitry Kamenetsky, Feb 06 2009
a(6) from Michael S. Branicky, Jan 30 2023
STATUS
approved