OFFSET
1,1
COMMENTS
Terms > 1000 often correspond only to strong pseudoprimes.
a(5) > 10^5. - Robert Price, Oct 03 2012
PROG
(PARI) is(n)=ispseudoprime(32^n-31^n) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
KEYWORD
nonn,hard
AUTHOR
Mike Oakes, May 18 2001, May 19 2001
EXTENSIONS
a(4) from Robert Price, Oct 03 2012
STATUS
approved