Primality proof for n = 593:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=37.html>37 is prime.</a>
<br>b^((n-1)/37)-1 mod n = 305, which is a unit, inverse 35.
<p>(37) divides n-1.
<p>(37)^2 > n.
<p>n is prime by Pocklington's theorem.