Primality proof for n = 3460921:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=191.html>191 is prime.</a>
<br>b^((n-1)/191)-1 mod n = 1264407, which is a unit, inverse 386992.
<p><a href=151.html>151 is prime.</a>
<br>b^((n-1)/151)-1 mod n = 1043641, which is a unit, inverse 722802.
<p>(151 * 191) divides n-1.
<p>(151 * 191)^2 > n.
<p>n is prime by Pocklington's theorem.