Primality proof for n = 8963:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=4481.html>4481 is prime.</a>
<br>b^((n-1)/4481)-1 mod n = 3, which is a unit, inverse 2988.
<p>(4481) divides n-1.
<p>(4481)^2 > n.
<p>n is prime by Pocklington's theorem.