1,2

a(6) > 10^3.

Numbers k such that A051443(k)+1 is prime. - Michel Marcus, Oct 08 2019

Table of n, a(n) for n=1..5.

Select[Range[120], PrimeQ[#^(# + 1)*(# + 1)^# + 1] &] (* Amiram Eldar, Oct 08 2019 *)

(MAGMA) [n: n in [1..500] | IsPrime(n^(n+1)*(n+1)^n+1)];

Cf. A000040, A051443.

Sequence in context: A190045 A247035 A069512 * A116639 A220274 A036433

Adjacent sequences: A328214 A328215 A328216 * A328218 A328219 A328220

nonn,more

Juri-Stepan Gerasimov, Oct 08 2019

approved