Primality proof for n = 665290456380049:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=43936391.html>43936391 is prime.</a>
<br>b^((n-1)/43936391)-1 mod n = 441204432317574, which is a unit, inverse 27740430352642.
<p>(43936391) divides n-1.
<p>(43936391)^2 > n.
<p>n is prime by Pocklington's theorem.