First twelve numbers

Add 15, subtract 10 (first term: 4)

1st - 4, 2nd - 9, 3rd - 14, 4th - 19, 5th - 24, 6th - 29, 7th - 34, 8th - 39, 9th - 44, 10th - 49, 11th - 54, 12th-59

Step-by-step explanation:

1st - 4

2nd - 4+15-10 = 9

3rd - 9+15-10=14

4th - 14+15-10=19

5th - 19+15-10=24

6th - 24+15-10=29

7th - 29+15-10=34

8th - 34+15-10=39

9th - 39+15-10=44

10th - 44+15-10=49

11th - 49+15-10=54

12th-54+15-10=59