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As aaa ranged over all positive integers, what is/are the value(s) of
gcd(a2−a−1,a2+a+1)? \gcd(a^2 -a-1, a^2 + a + 1 ) ? gcd(a2−a−1,a2+a+1)?
Notation: gcd(⋅)\gcd(\cdot) gcd(⋅) denotes the greatest common divisor function.
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