Question

f(n)=2n+1 (n∈N) if n is a prime number or f(n)=n/p,p is the most prime factor of n,then f(f(...f(n)...))=3 or 5,is this correct?

Answer 1

is'nt 2n+1 odd numbers,3,5,7...

Answer 2

i dont understand it

Answer 3

f(f(...f(n)...))=3 or 5
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how many f's? n times?

Answer 4

if its n times f...then its not a true statement because :

\[f^{15}(15)=15\]

Answer 5

No,not n times,any times,it always equal 3 or 5.

Answer 6

are we to stop when 3 or 5 results...

Answer 7

yes ,stop at 3 or 5 result.