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Well, escaping the newlines works, but's it's ugly:
%gp
lucas(p) ={\
my(u,q); \
u=4;\
q=1<<p - 1;\
for(k=3,p, u = (sqr(u)-2) % q);\
u == 0;\
}
lucas(5)
I think this might be a bug (or undocumented feature) in the GP interface.
