Primality proof for n = 3972738854007370570932605213:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=49290007066067.html>49290007066067 is prime.</a>
<br>b^((n-1)/49290007066067)-1 mod n = 3289702716637765437499339632, which is a unit, inverse 752304189260465354422677905.
<p><a href=8097347.html>8097347 is prime.</a>
<br>b^((n-1)/8097347)-1 mod n = 531717846300181929421050333, which is a unit, inverse 228094226755197230112751083.
<p>(8097347 * 49290007066067) divides n-1.
<p>(8097347 * 49290007066067)^2 > n.
<p>n is prime by Pocklington's theorem.