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

Offset

1,3

Comments

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

Links

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

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

Status

approved