45

40

50

35

1, 4, 7, 10, 13

3, 6, 9, 12, 15

5, 10, 15, 20, 25

2, 6, 18, 54, 162

15

16

17

18

an = 2n + 3

an = n² + 1

an = 3n - 1

an = 4n - 2