A083366 Numbers k such that 7*11^k + 2 is prime.

1, 3, 5, 9, 23, 65, 95, 129, 161, 341, 439, 771, 819, 1031, 1099, 1443, 1923, 5793, 15527, 15963, 36827

Offset

1,2

Comments

Values corresponding to 5, 9, 23, 65, 95, 129, 161, 341, 439, 771, 819, 1031, 1099 and 1443 (1504 digits) have been certified prime with Primo. Values for 1923 (2004 digits) and 5793 (6034 digits) are probable primes. There are no other terms <= 6000.

Links

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

Prog

(PARI) for(n=1, 6000, if(isprime(7*11^n+2), print1(n, ", ")))

Crossrefs

Sequence in context: A241398 A373897 A262483 * A006722 A251413 A039774

Adjacent sequences: A083363 A083364 A083365 * A083367 A083368 A083369

Keyword

nonn,more

Author

Rick L. Shepherd, May 03 2003

Extensions

a(19)-a(20) from Michael S. Branicky, Jul 14 2023

a(21) from Michael S. Branicky, Sep 09 2024

Status

approved