Respuesta :

The answer to 15 is 15.

The answer to 16 is 17.

The answer to 17 is (I believe) 11.

The answer to 18 is 76.

I can explain more thoroughly in the comments if you need it? Just let me know

Answer:

15 is 15.

16 is 17.

17 is 22

18 is 76.