Primality proof for n = 12791:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=1279.html>1279 is prime.</a>
<br>b^((n-1)/1279)-1 mod n = 1023, which is a unit, inverse 3651.
<p>(1279) divides n-1.
<p>(1279)^2 > n.
<p>n is prime by Pocklington's theorem.