jmc

Question

The function f (n) = n^2 + n + 17 for 0 n 15 generates prime numbers. What is the value of f (10)-f (9)?

Accepted Answer

We have f(10)-f(9) = (10^2+10+17)-(9^2+9+17) = 10^2-9^2+10-9 = 100-81+1 = 20.