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 A268987 Primes of the form k^(k + 1) + k - 1. 2
 83, 15629, 279941, 3486784409, 6568408355712890639 (list; graph; refs; listen; history; text; internal format)
 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

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Last modified May 21 22:16 EDT 2024. Contains 372741 sequences. (Running on oeis4.)