Primality proof for n = 3774773:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=943693.html>943693 is prime.</a>
<br>b^((n-1)/943693)-1 mod n = 15, which is a unit, inverse 3271470.
<p>(943693) divides n-1.
<p>(943693)^2 > n.
<p>n is prime by Pocklington's theorem.