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f(a,n)int*a;{n=n=*a+*++a-a[1]||--n<2||*a+*++a==a[1]&&fn>2&&f(a,n);}
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-1 byte by inverting output, thanks to @AZTECCO
Recursive.
f(a,n)int*a;{n=--n<2||*a+*++a==a[1]&&f(a,n);}
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f(a,n)int*a;{n=*a+*++a-a[1]||--n>2&&f(a,n);}
