OFFSET
1,2
COMMENTS
a(6) > 10^3.
Numbers k such that A051443(k)+1 is prime. - Michel Marcus, Oct 08 2019
a(6) > 10^4, if it exists. - Michael S. Branicky, Aug 24 2024
MATHEMATICA
Select[Range[120], PrimeQ[#^(# + 1)*(# + 1)^# + 1] &] (* Amiram Eldar, Oct 08 2019 *)
PROG
(Magma) [n: n in [1..500] | IsPrime(n^(n+1)*(n+1)^n+1)];
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Juri-Stepan Gerasimov, Oct 08 2019
STATUS
approved