A057471 Numbers k such that (11*13^k -1)/2 is prime.

0, 1, 2, 5, 9, 11, 21, 42, 46, 61, 69, 70, 78, 99, 183, 361, 1034, 1291, 1570, 1838, 5994, 33138

Offset

1,3

Comments

a(22) > 10^4. - Jinyuan Wang, Jan 31 2020

Links

Table of n, a(n) for n=1..22.

Mathematica

Do[ If[ PrimeQ[(11*13^n - 1)/2], Print[n]], {n, 0, 2700}]

Prog

(PARI) is(n)=ispseudoprime((11*13^n-1)/2) \\ Charles R Greathouse IV, Jun 13 2017

Crossrefs

Sequence in context: A263637 A347305 A343878 * A295608 A349048 A099434

Adjacent sequences: A057468 A057469 A057470 * A057472 A057473 A057474

Keyword

nonn,more

Author

Robert G. Wilson v, Sep 10 2000

Extensions

a(21) from Jinyuan Wang, Jan 31 2020

a(22) from Michael S. Branicky, Jul 11 2024

Status

approved