Primality proof for n = 134921:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=3373.html>3373 is prime.</a>
<br>b^((n-1)/3373)-1 mod n = 57396, which is a unit, inverse 125403.
<p>(3373) divides n-1.
<p>(3373)^2 > n.
<p>n is prime by Pocklington's theorem.