Primality proof for n = 379979:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=189989.html>189989 is prime.</a>
<br>b^((n-1)/189989)-1 mod n = 3, which is a unit, inverse 126660.
<p>(189989) divides n-1.
<p>(189989)^2 > n.
<p>n is prime by Pocklington's theorem.