Primality proof for n = 1249292843947:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=3670871.html>3670871 is prime.</a>
<br>b^((n-1)/3670871)-1 mod n = 1130826922106, which is a unit, inverse 151661628123.
<p>(3670871) divides n-1.
<p>(3670871)^2 > n.
<p>n is prime by Pocklington's theorem.