Primality proof for n = 105957871:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=881.html>881 is prime.</a>
<br>b^((n-1)/881)-1 mod n = 104514594, which is a unit, inverse 105424586.
<p><a href=211.html>211 is prime.</a>
<br>b^((n-1)/211)-1 mod n = 5432007, which is a unit, inverse 51324448.
<p>(211 * 881) divides n-1.
<p>(211 * 881)^2 > n.
<p>n is prime by Pocklington's theorem.