OFFSET
1,1
COMMENTS
Corresponding primes are in A133858.
11^22420-2 is a 23349-digit probable prime found with PrimeForm.
a(8) > 10^5. - Robert Price, Mar 26 2014
a(4) through a(7) also correspond to probable primes. - Robert Price, Mar 27 2014
PROG
(PARI) is(n)=ispseudoprime(11^n-2) \\ Charles R Greathouse IV, May 22 2017
CROSSREFS
KEYWORD
hard,nonn,more
AUTHOR
Rick L. Shepherd, Sep 30 2007
EXTENSIONS
a(4)-a(7) from Robert Price, Mar 26 2014
a(8) from Paul Bourdelais, Nov 03 2021
STATUS
approved