Primality proof for n = 173297:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=10831.html>10831 is prime.</a>
<br>b^((n-1)/10831)-1 mod n = 65535, which is a unit, inverse 99935.
<p>(10831) divides n-1.
<p>(10831)^2 > n.
<p>n is prime by Pocklington's theorem.