Primality proof for n = 1940901878027589158559608212721:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=426050702417.html>426050702417 is prime.</a>
<br>b^((n-1)/426050702417)-1 mod n = 623925913228564101241520854055, which is a unit, inverse 1821014813758900622500848532134.
<p><a href=93179.html>93179 is prime.</a>
<br>b^((n-1)/93179)-1 mod n = 164260977705796339867697392344, which is a unit, inverse 1580256537309896012768527145117.
<p>(93179 * 426050702417) divides n-1.
<p>(93179 * 426050702417)^2 > n.
<p>n is prime by Pocklington's theorem.