Răspuns :

Morwannegid
Stim ca 3 ²=9 , 3³= 27 [tex]3 ^{4} = 81[/tex]
 [tex]3 ^{5} = 243[/tex]
f(3) = 3 + 2= 5
f(9) = 9 +2 =11
f(27)= 27+ 2= 29
f(81)= 81+2= 83
f(243)= 243 + 2= 245
f(3) + f(9) + f(27) + f(81) + f(243) = 5+11+29+83+245=373