Primality proof for n = 290923:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=48487.html>48487 is prime.</a>
<br>b^((n-1)/48487)-1 mod n = 63, which is a unit, inverse 106210.
<p>(48487) divides n-1.
<p>(48487)^2 > n.
<p>n is prime by Pocklington's theorem.