Primality proof for n = 33191:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=3319.html>3319 is prime.</a>
<br>b^((n-1)/3319)-1 mod n = 1023, which is a unit, inverse 22030.
<p>(3319) divides n-1.
<p>(3319)^2 > n.
<p>n is prime by Pocklington's theorem.