OFFSET
1,1
COMMENTS
Terms greater than 1000 often correspond only to strong pseudoprimes. [Clarified by M. F. Hasler, Sep 15 2013]
a(4) > 10^5. - Robert Price, Mar 01 2013
LINKS
H. Lifchitz, R. Lifchitz, PRP top records (of the form 60^n-59^n)
PROG
(PARI) is(n)=ispseudoprime(60^n-59^n) \\ Charles R Greathouse IV, Jun 13 2017
CROSSREFS
KEYWORD
nonn,hard,bref
AUTHOR
Mike Oakes, May 18 2001, May 19 2001
EXTENSIONS
a(3) from Robert Price, Mar 01 2013
STATUS
approved