Primality proof for n = 13928737:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=145091.html>145091 is prime.</a>
<br>b^((n-1)/145091)-1 mod n = 72827, which is a unit, inverse 862573.
<p>(145091) divides n-1.
<p>(145091)^2 > n.
<p>n is prime by Pocklington's theorem.