OFFSET
1,1
COMMENTS
The next term is too large to include here.
281 = 3^5 + 2^5 + 5 + 1,..
The corresponding values of k are 1, 5, 13, 905, 5341, ... ; a(5) ~ 2.016...*10^2548. - Amiram Eldar, Jul 18 2019
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..4
MATHEMATICA
Select[Array[3^#+2^#+#+1&, 2*6! ], PrimeQ[ # ]&]
CROSSREFS
KEYWORD
nonn,bref
AUTHOR
Vladimir Joseph Stephan Orlovsky, Apr 07 2010
STATUS
approved