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