/usr/share/doc/pari-gp/examples/lucas.gp is in pari-gp 2.5.5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | lucas(p) =
{
my(u,q); u=4; q=1<<p - 1;
for(k=3,p, u = (sqr(u)-2) % q);
u == 0;
}
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