Primality proof for n = 67219:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=659.html>659 is prime.</a>
<br>b^((n-1)/659)-1 mod n = 17348, which is a unit, inverse 20540.
<p>(659) divides n-1.
<p>(659)^2 > n.
<p>n is prime by Pocklington's theorem.