It is 39*n+1 when divided by n, for any integer n.
2 can go into 39 a total of 19 times, with a remainder of 1. This is because 2 multiplied by 19 equals 38, which is the largest multiple of 2 that is less than or equal to 39. Thus, 39 divided by 2 equals 19 with a remainder.
69.1111
4
210.25
11.125
2.3333
11.3333
18.125
21 divided by 5 equals 4 with a remainder of 1.
5.25
4.2
19.2