Primality proof for n = 3727:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=23.html>23 is prime.</a>
<br>b^((n-1)/23)-1 mod n = 438, which is a unit, inverse 3259.
<p><a href=3.html>3 is prime.</a>
<br>b^((n-1)/3)-1 mod n = 1187, which is a unit, inverse 2088.
<p>(3^4 * 23) divides n-1.
<p>(3^4 * 23)^2 > n.
<p>n is prime by Pocklington's theorem.