OFFSET
1,1
COMMENTS
Terms given correspond to n in A057900.
a(4) has 731 digits.
MATHEMATICA
Select[Table[3^n + n, {n, 1, 1000}], PrimeQ]
PROG
(Magma) [a: n in [0..100] | IsPrime(a) where a is 3^n+n];
CROSSREFS
KEYWORD
nonn,bref,more
AUTHOR
Vincenzo Librandi, Jun 06 2016
STATUS
approved