A168170 - OEIS

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A168170

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

1

0, 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, 53655, 54294, 68431

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..29.

PROG

(PARI) for(n=0, 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(15)-a(23) from Michael S. Branicky, Jan 13 2023

a(24)-a(26) from Michael S. Branicky, Mar 10 2023

a(1)=0 and a(27)-a(29) from Michael S. Branicky, Sep 26 2024

STATUS

approved