A168170 Numbers k such that 3^k + 3^4 + 1 is prime.

3, 4, 6, 7, 22, 28, 39, 115, 144, 379, 391, 858, 1851, 5815, 7495, 7686, 7726, 9636, 13006, 19063, 19719, 21202, 25516, 26542, 31204

Offset

1,1

Links

Table of n, a(n) for n=1..25.

Prog

(PARI) for(n=1, 9999, ispseudoprime(3^n+3^4+1)&print1(n", "))

Crossrefs

The corresponding primes are listed in A102908.

Sequence in context: A253888 A289811 A161001 * A290115 A225794 A206769

Adjacent sequences: A168167 A168168 A168169 * A168171 A168172 A168173

Keyword

nonn,more

Author

M. F. Hasler, Nov 25 2009

Extensions

a(14)-a(22) from Michael S. Branicky, Jan 13 2023

a(23)-a(25) from Michael S. Branicky, Mar 10 2023

Status

approved