Primality proof for n = 256117:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=3049.html>3049 is prime.</a>
<br>b^((n-1)/3049)-1 mod n = 240561, which is a unit, inverse 211285.
<p>(3049) divides n-1.
<p>(3049)^2 > n.
<p>n is prime by Pocklington's theorem.