we define f(n) as the number of different ways that we can write natural number n like addition of two coprime numbers..exmple 5:=3+2=4+1 so f(5)=2 or f(4)=1(3+2 and 2+3 is like one way)now we define r(n) as the number of diferent prime dividers of natural n..example: 6/3=26/2=3 so r(6)=2..find:

we define f(n) as the number of different ways that we can write natural number n like addition of two coprime numbers..exmple 5:=3+2=4+1 so f(5)=2 or f(4)=1(3+2 and 2+3 is like one way)now we define r(n) as the number of diferent prime dividers of natural n..example: 6/3=26/2=3 so r(6)=2..find:

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