Primality proof for n = 3224909:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=42433.html>42433 is prime.</a>
<br>b^((n-1)/42433)-1 mod n = 299772, which is a unit, inverse 1286889.
<p>(42433) divides n-1.
<p>(42433)^2 > n.
<p>n is prime by Pocklington's theorem.