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A187605 Primes of the form k^k + k - 1. 4
5, 29, 1978419655660313589123997, 205891132094649000000000000000000000000000029 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

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.

MATHEMATICA

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

PROG

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

CROSSREFS

Cf. A058912, A231712, A268987.

Sequence in context: A228028 A237256 A172041 * A266569 A098346 A134166

Adjacent sequences:  A187602 A187603 A187604 * A187606 A187607 A187608

KEYWORD

nonn

AUTHOR

Marco Ripà, Mar 11 2011

STATUS

approved

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Last modified November 23 21:51 EST 2020. Contains 338603 sequences. (Running on oeis4.)