Primality proof for n = 1942692491:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=68477.html>68477 is prime.</a>
<br>b^((n-1)/68477)-1 mod n = 810102655, which is a unit, inverse 665058820.
<p>(68477) divides n-1.
<p>(68477)^2 > n.
<p>n is prime by Pocklington's theorem.