Primality proof for n = 124769:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=557.html>557 is prime.</a>
<br>b^((n-1)/557)-1 mod n = 91926, which is a unit, inverse 68913.
<p>(557) divides n-1.
<p>(557)^2 > n.
<p>n is prime by Pocklington's theorem.