Primality proof for n = 7691:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=769.html>769 is prime.</a>
<br>b^((n-1)/769)-1 mod n = 1023, which is a unit, inverse 7067.
<p>(769) divides n-1.
<p>(769)^2 > n.
<p>n is prime by Pocklington's theorem.