Primality proof for n = 260441:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=383.html>383 is prime.</a>
<br>b^((n-1)/383)-1 mod n = 201106, which is a unit, inverse 44600.
<p><a href=17.html>17 is prime.</a>
<br>b^((n-1)/17)-1 mod n = 234875, which is a unit, inverse 11603.
<p>(17 * 383) divides n-1.
<p>(17 * 383)^2 > n.
<p>n is prime by Pocklington's theorem.