Primality proof for n = 252949:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=197.html>197 is prime.</a>
<br>b^((n-1)/197)-1 mod n = 2526, which is a unit, inverse 118864.
<p><a href=107.html>107 is prime.</a>
<br>b^((n-1)/107)-1 mod n = 98857, which is a unit, inverse 108777.
<p>(107 * 197) divides n-1.
<p>(107 * 197)^2 > n.
<p>n is prime by Pocklington's theorem.