Primality proof for n = 37409:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=167.html>167 is prime.</a>
<br>b^((n-1)/167)-1 mod n = 23542, which is a unit, inverse 27441.
<p><a href=7.html>7 is prime.</a>
<br>b^((n-1)/7)-1 mod n = 26260, which is a unit, inverse 29846.
<p>(7 * 167) divides n-1.
<p>(7 * 167)^2 > n.
<p>n is prime by Pocklington's theorem.