A238378 Numbers k such that (k+1)^(k-1) + k is prime.

1, 2, 3, 5, 7, 8, 158, 536, 4670, 9795

Offset

1,2

Comments

Next term is >= 30000.

Links

Table of n, a(n) for n=1..10.

Example

3 is in the sequence since (3+1)^(3-1) + 3 = 4^2 + 3 = 19 is prime.

Mathematica

Select[Range[600], PrimeQ[(#+1)^(#-1)+#]&] (* The program generates the first eight terms of the sequence. *) (* Harvey P. Dale, Feb 07 2024 *)

Prog

(PARI) is(n)=isprime((n+1)^(n-1)+n) \\ Charles R Greathouse IV, Jun 06 2017

Crossrefs

Cf. A187602 (corresponding primes).

Sequence in context: A350707 A285282 A105404 * A075012 A067090 A284173

Adjacent sequences: A238375 A238376 A238377 * A238379 A238380 A238381

Keyword

nonn,hard,more

Author

Matevz Markovic, Feb 25 2014

Status

approved