Primality proof for n = 858397:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=929.html>929 is prime.</a>
<br>b^((n-1)/929)-1 mod n = 730925, which is a unit, inverse 575387.
<p>(929) divides n-1.
<p>(929)^2 > n.
<p>n is prime by Pocklington's theorem.