http://tinypic(DOT)com/r/2zfintg/8
Please help explain me this question. If you have a problem with the picture please let me know. Thanks in advance!
f1 = 3
f2 = 33 + 1 = 10 (note 3 is odd)
f3 = 10/2 = 5 (10 is even)
f4 = 53 + 1 = 16
f_5 = 16/2 = 8.
Thanks so much @MITer94