

A062585


Numbers n such that 19^n  18^n is prime.


4




OFFSET

1,1


COMMENTS

PrimePi[ a(n) ] = {2, 253, 287, 1331, ...}.  Alexander Adamchuk, Feb 16 2007
a(5) > 10^5.  Robert Price, Jun 05 2012
Terms greater than 1000 may correspond to (unproven) strong pseudoprimes 19^n  18^n.  M. F. Hasler, Sep 16 2013


LINKS

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


PROG

(PARI) is(n)=ispseudoprime(19^n18^n) \\ Charles R Greathouse IV, Feb 20 2017


CROSSREFS

Cf. A000043, A057468, A059801, A059802, A062572A062583, A188051, A062586A062666.
Sequence in context: A110027 A179866 A201242 * A239505 A002490 A179961
Adjacent sequences: A062582 A062583 A062584 * A062586 A062587 A062588


KEYWORD

nonn,hard,changed


AUTHOR

Mike Oakes, May 18 2001, May 19 2001


EXTENSIONS

10957 was found by Mike Oakes in 2003.  Alexander Adamchuk, Feb 16 2007


STATUS

approved



