

A062635


Numbers k such that 69^k  68^k is prime.


0




OFFSET

1,1


COMMENTS

Terms greater than 1000 are often only strong pseudoprimes.
a(5) > 10^5.  Robert Price, Dec 16 2013


LINKS

Table of n, a(n) for n=1..4.


PROG

(PARI) is(n)=ispseudoprime(69^n68^n) \\ Charles R Greathouse IV, Jun 13 2017


CROSSREFS

Cf. A000043, A057468, A059801, A059802, A062572A062666.
Sequence in context: A261535 A327020 A058233 * A060835 A122054 A284706
Adjacent sequences: A062632 A062633 A062634 * A062636 A062637 A062638


KEYWORD

nonn,hard,bref


AUTHOR

Mike Oakes, May 18 2001, May 19 2001


EXTENSIONS

a(4) from Robert Price, Dec 16 2013 (Computer run by Adam Marciniec)


STATUS

approved



