Primality proof for n = 8039:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=4019.html>4019 is prime.</a>
<br>b^((n-1)/4019)-1 mod n = 3, which is a unit, inverse 2680.
<p>(4019) divides n-1.
<p>(4019)^2 > n.
<p>n is prime by Pocklington's theorem.