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D.12.2.4 Cornacchia

Procedure from library atkins.lib (see atkins_lib).

Usage:
Cornacchia(d,p);

Return:
x,y such that x^2+d*y^2=p with p prime,
-1, if the Diophantine equation has no solution,
0, if the parameters are wrong selected

Assume:
0<d<p

Example:
 
LIB "atkins.lib";
Cornacchia(55,9551);
==> [1]:
==>    16
==> [2]:
==>    13