If f f f maps the set of natural numbers to whole numbers such that f ( x y ) = f ( x ) f ( y ) + f ( x ) + f ( y ) f(xy) = f(x)f(y) + f(x) + f(y) f (...

Question

If

ff
maps the set of natural numbers to whole numbers such that
f(xy)=f(x)f(y)+f(x)+f(y)f(xy) = f(x)f(y) + f(x) + f(y)
for all
x,yx, y
, and
f(p)=1f(p) = 1
for every prime number
pp
, then the value of
f(160000)f(160000)
is

Options

A.

1023

B.

4095

C.

2047

D.

8191

cat 2024functional equationsnatural numbersprimes

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