Primality proof for n = 6659:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=3329.html>3329 is prime.</a>
<br>b^((n-1)/3329)-1 mod n = 3, which is a unit, inverse 2220.
<p>(3329) divides n-1.
<p>(3329)^2 > n.
<p>n is prime by Pocklington's theorem.