Primality proof for n = 22871:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=2287.html>2287 is prime.</a>
<br>b^((n-1)/2287)-1 mod n = 1023, which is a unit, inverse 9211.
<p>(2287) divides n-1.
<p>(2287)^2 > n.
<p>n is prime by Pocklington's theorem.