A112881 Indices of prime Perrin numbers; values of n such that A001608(n) is prime.

2, 3, 4, 5, 6, 7, 10, 12, 20, 21, 24, 34, 38, 75, 122, 166, 236, 355, 356, 930, 1042, 1214, 1461, 1622, 4430, 5802, 9092, 16260, 18926, 23698, 40059, 45003, 73807, 91405, 263226, 316872, 321874, 324098, 581132, 939189, 1034005, 1430138

Offset

1,1

Links

Table of n, a(n) for n=1..42.

Eric Weisstein's World of Mathematics, Perrin Prime.

Eric Weisstein's World of Mathematics, Integer Sequence Primes.

Mathematica

Position[RootSum[-1 - # + #^3 &, #^Range[2000] &], _?PrimeQ] // Flatten (* Eric W. Weisstein, Jun 05 2026 *)

Crossrefs

Cf. A001608, A074788.

Sequence in context: A379295 A342726 A164947 * A389645 A391352 A308019

Adjacent sequences: A112878 A112879 A112880 * A112882 A112883 A112884

Keyword

nonn,more

Author

Eric W. Weisstein, Oct 05 2005

Extensions

a(34) from Eric W. Weisstein, Oct 06 2005

a(35) = 263226 from Eric W. Weisstein, May 04 2006

a(36) = 316872 from Eric W. Weisstein, Feb 04 2007

a(37) = 321874 from Eric W. Weisstein, Feb 19 2007

a(38) = 324098 from Eric W. Weisstein, Feb 25 2007

a(39) = 581132 from Eric W. Weisstein, Feb 15 2011

a(40)-a(42) from Ryan Propper, Jun 19 2022

Status

approved