Primality proof for n = 81371:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=103.html>103 is prime.</a>
<br>b^((n-1)/103)-1 mod n = 27717, which is a unit, inverse 320.
<p><a href=79.html>79 is prime.</a>
<br>b^((n-1)/79)-1 mod n = 76290, which is a unit, inverse 4340.
<p>(79 * 103) divides n-1.
<p>(79 * 103)^2 > n.
<p>n is prime by Pocklington's theorem.