A187605 Primes of the form k^k + k - 1.

5, 29, 1978419655660313589123997, 205891132094649000000000000000000000000000029

Offset: 1

Author

Marco Ripà, Mar 11 2011

Keywords

• nonn

Comments

See A058912 for numbers k such that k^k + k - 1 is prime. Subsequence of A231712 (numbers n^n + n - 1). - Jaroslav Krizek, Nov 13 2013

The next prime has 1460 digits. - Jinyuan Wang, Mar 01 2020

Links

• Table of n, a(n) for n = 1..4
• Aldo Roberto Pessolano, Table of n, a(n) for n = 1..6

Crossrefs

Cf. A058912, A231712, A268987.

Programs

Mathematica

Do[p=n^n+n-1; If[PrimeQ[p], Print[p]], {n, 100}]

PARI

lista(nn) = for(k=1, nn, if(ispseudoprime(q=k^k+k-1), print1(q, ", "))); \\ Jinyuan Wang, Mar 01 2020