Primality proof for n = 8436937:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=3413.html>3413 is prime.</a>
<br>b^((n-1)/3413)-1 mod n = 6273929, which is a unit, inverse 6605832.
<p>(3413) divides n-1.
<p>(3413)^2 > n.
<p>n is prime by Pocklington's theorem.