A095379 Primes of the form 1 + A094125(k) = 1 + 3*2^k + 2*3^k.

13, 31, 79, 211, 4759, 40903, 121171, 360439, 1075171, 2326095799, 62774702131, 564909404611, 53177629140127471641559, 1668770336663931954974790774345703

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..21

Formula

a(n) = 1 + A094125(A095378(n)). - Jinyuan Wang, Aug 26 2019

Example

The prime 211 is a term because 211 = 1 + 3*2^4 + 2*3^4.

Mathematica

Select[Table[1 + 3*2^k + 2*3^k, {k, 1, 70}], PrimeQ] (* Amiram Eldar, Aug 18 2024 *)

Prog

(PARI) lista(kmax) = {my(p); for(k = 1, kmax, p = 1 + 3*2^k + 2*3^k; if(isprime(p), print1(p, ", "))); } \\ Amiram Eldar, Aug 18 2024

Crossrefs

Cf. A094125, A095378.

Sequence in context: A107288 A335732 A342706 * A350095 A160772 A271575

Adjacent sequences: A095376 A095377 A095378 * A095380 A095381 A095382

Keyword

nonn,changed

Author

Labos Elemer, Jun 07 2004

Status

approved