Primality proof for n = 3670871:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=229.html>229 is prime.</a>
<br>b^((n-1)/229)-1 mod n = 2900748, which is a unit, inverse 2596531.
<p>(229^2) divides n-1.
<p>(229^2)^2 > n.
<p>n is prime by Pocklington's theorem.