Primality proof for n = 3373:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=281.html>281 is prime.</a>
<br>b^((n-1)/281)-1 mod n = 722, which is a unit, inverse 612.
<p>(281) divides n-1.
<p>(281)^2 > n.
<p>n is prime by Pocklington's theorem.