Primality proof for n = 166823:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=349.html>349 is prime.</a>
<br>b^((n-1)/349)-1 mod n = 122817, which is a unit, inverse 148964.
<p><a href=239.html>239 is prime.</a>
<br>b^((n-1)/239)-1 mod n = 85940, which is a unit, inverse 120804.
<p>(239 * 349) divides n-1.
<p>(239 * 349)^2 > n.
<p>n is prime by Pocklington's theorem.