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URL: https://oeis.org/A268987

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A268987
Primes of the form k^(k + 1) + k - 1.
2
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
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. A309140 (the corresponding values of k).
Sequence in context: A202657 A180846 A097839 * A087189 A201727 A116263
KEYWORD
nonn
AUTHOR
Soumadeep Ghosh, Feb 16 2016
STATUS
approved