Primality proof for n = 2833687:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=157427.html>157427 is prime.</a>
<br>b^((n-1)/157427)-1 mod n = 262143, which is a unit, inverse 1809922.
<p>(157427) divides n-1.
<p>(157427)^2 > n.
<p>n is prime by Pocklington's theorem.