Primality proof for n = 28307:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=14153.html>14153 is prime.</a>
<br>b^((n-1)/14153)-1 mod n = 3, which is a unit, inverse 9436.
<p>(14153) divides n-1.
<p>(14153)^2 > n.
<p>n is prime by Pocklington's theorem.