Primality proof for n = 25969:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=541.html>541 is prime.</a>
<br>b^((n-1)/541)-1 mod n = 10392, which is a unit, inverse 22428.
<p>(541) divides n-1.
<p>(541)^2 > n.
<p>n is prime by Pocklington's theorem.