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A057471 Numbers k such that (11*13^k -1)/2 is prime. 0
0, 1, 2, 5, 9, 11, 21, 42, 46, 61, 69, 70, 78, 99, 183, 361, 1034, 1291, 1570, 1838, 5994 (list; graph; refs; listen; history; text; internal format)
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 A343878 A347305 * A295608 A099434 A191104

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

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Last modified September 19 18:36 EDT 2021. Contains 347564 sequences. (Running on oeis4.)