Primality proof for n = 163027:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=3019.html>3019 is prime.</a>
<br>b^((n-1)/3019)-1 mod n = 21839, which is a unit, inverse 73261.
<p>(3019) divides n-1.
<p>(3019)^2 > n.
<p>n is prime by Pocklington's theorem.