Primality proof for n = 126241:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=263.html>263 is prime.</a>
<br>b^((n-1)/263)-1 mod n = 40022, which is a unit, inverse 81428.
<p><a href=5.html>5 is prime.</a>
<br>b^((n-1)/5)-1 mod n = 118277, which is a unit, inverse 71284.
<p>(5 * 263) divides n-1.
<p>(5 * 263)^2 > n.
<p>n is prime by Pocklington's theorem.