Primality proof for n = 858467:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=3607.html>3607 is prime.</a>
<br>b^((n-1)/3607)-1 mod n = 514513, which is a unit, inverse 359309.
<p>(3607) divides n-1.
<p>(3607)^2 > n.
<p>n is prime by Pocklington's theorem.