Primality proof for n = 37997:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=59.html>59 is prime.</a>
<br>b^((n-1)/59)-1 mod n = 4997, which is a unit, inverse 37229.
<p><a href=23.html>23 is prime.</a>
<br>b^((n-1)/23)-1 mod n = 26633, which is a unit, inverse 37131.
<p>(23 * 59) divides n-1.
<p>(23 * 59)^2 > n.
<p>n is prime by Pocklington's theorem.