The recurrence fn=fn−1+20f_n = f_{n-1} + 20fn=fn−1+20 with f1=17f_1 = 17f1=17 gives fn=17+(n−1)cdot20f_n = 17 + (n-1) \\cdot 20fn=17+(n−1)cdot20. What is f6f_6f6?
100100100
120120120
105105105
117117117