

A188051


Numbers k such that 18^k  17^k is prime, or a strong pseudoprime.


2




OFFSET

1,1


COMMENTS

Terms < 10000 found by Mike Oakes.
Term 14533 found by Lelio R Paula in June 2008 corresponding to a probable prime with 18243 digits.
Terms 26641 and 48179 found by JeanLouis Charton in December 2010 corresponding to probable primes with 33442 and 60478 digits.
a(7) > 10^5.  Robert Price, Nov 30 2012


LINKS

Table of n, a(n) for n=1..6.
Top probable primes of the form 18^p17^p


PROG

(PARI) is(n)=ispseudoprime(18^n17^n) \\ Charles R Greathouse IV, Jun 06 2017


CROSSREFS

Cf. A000043, A057468, A059801, A059802, A059803, A062572A062583, A062585A062666.
Sequence in context: A137983 A059032 A214812 * A247230 A047159 A086662
Adjacent sequences: A188048 A188049 A188050 * A188052 A188053 A188054


KEYWORD

nonn,hard


AUTHOR

JeanLouis Charton, Mar 19 2011


EXTENSIONS

Edited by M. F. Hasler, Sep 21 2013


STATUS

approved



