Primality proof for n = 14720401:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=47.html>47 is prime.</a>
<br>b^((n-1)/47)-1 mod n = 8557480, which is a unit, inverse 10629675.
<p><a href=29.html>29 is prime.</a>
<br>b^((n-1)/29)-1 mod n = 12453323, which is a unit, inverse 9887646.
<p><a href=5.html>5 is prime.</a>
<br>b^((n-1)/5)-1 mod n = 5784941, which is a unit, inverse 1191016.
<p>(5^2 * 29 * 47) divides n-1.
<p>(5^2 * 29 * 47)^2 > n.
<p>n is prime by Pocklington's theorem.