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Omni-MATH / A number p is perfect if the sum of its divisors, except p is p. Let f be a function such that: f(n)=0, if n is perfect f(n)=0, if the last digit of n is 4 f(a.b)=f(a)+f(b) Find … · Discussion

Discussing A number p is perfect if the sum of its divisors, except p is p. Let f be a function such that: f(n)=0, if n is perfect f(n)=0, if the last digit of n is 4 f(a.b)=f(a)+f(b) Find … · Omni-MATH

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