Primality proof for n = 10211:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=1021.html>1021 is prime.</a>
<br>b^((n-1)/1021)-1 mod n = 1023, which is a unit, inverse 6987.
<p>(1021) divides n-1.
<p>(1021)^2 > n.
<p>n is prime by Pocklington's theorem.