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Omni-MATH / Find all functions f:N→N such that gcd(f(x),y)f(xy)=f(x)f(y) for all positive integers x,y. · Discussion

Discussing Find all functions f:N→N such that gcd(f(x),y)f(xy)=f(x)f(y) for all positive integers x,y. · Omni-MATH

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