A268987 Primes of the form k^(k + 1) + k - 1.

83, 15629, 279941, 3486784409, 6568408355712890639

Offset

1,1

Comments

The next prime has 171 digits. - Vincenzo Librandi, Feb 17 2016

Subsequence of primes of A155499. - Michel Marcus, Feb 20 2016

Links

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

Factordb, n^(n + 1) + n - 1.

Mathematica

Select[Table[n^(n + 1) + n - 1, {n, 1, 50}], ProvablePrimeQ[#] &]

Prog

(Magma) [a: n in [0..100] | IsPrime(a) where a is n^(n+1)+n-1]; // Vincenzo Librandi, Feb 17 2016
(PARI) lista(nn) = for(k=1, nn, if(ispseudoprime(q=k^(k+1)+k-1), print1(q, ", "))); \\ Jinyuan Wang, Mar 01 2020

Crossrefs

Cf. A155499, A161471, A161472, A187602, A187605.

Cf. A309140 (the corresponding values of k).

Sequence in context: A202657 A180846 A097839 * A087189 A201727 A116263

Adjacent sequences: A268984 A268985 A268986 * A268988 A268989 A268990

Keyword

nonn

Author

Soumadeep Ghosh, Feb 16 2016

Status

approved