Define:
$x_n=({1248}^{n}mod32323)-16161$
$y_n=({8421}^{n}mod30103)-15051$
$P_n=\{(x_1,y_1),(x_2,y_2),\dots ,(x_n,y_n)\}$

For example, $P_8=\{(-14913,-6630),$$(-10161,5625),$$(5226,11896),$$(8340,-10778),$$(15852,-5203),$$(-15165,11295),$$(-1427,-14495),$$(12407,1060)\}$.

Let $C(n)$ be the number of triangles whose vertices are in $P_n$ which contain the origin in the interior.

Examples:
$C(8)=20$
$C(600)=8950634$
$C(40000)=2666610948988$

Find $C(2000000)$.