In the harmonic sequence 1/3,1/8,1/13, … which term is 1/123?

listfor(n,1, 25, (1 /(5*n - 2)))==(1 / 3, 1 / 8, 1 / 13, 1 / 18, 1 / 23, 1 / 28, 1 / 33, 1 / 38, 1 / 43, 1 / 48, 1 / 53, 1 / 58, 1 / 63, 1 / 68, 1 / 73, 1 / 78, 1 / 83, 1 / 88, 1 / 93, 1 / 98, 1 / 103, 1 / 108, 1 / 113, 1 / 118, 1 / 123).              1/123 would be the 25th term.

1/3, 1/8, 1/13 ......  

The formula for  the  nth term is

1 / [ 3 + 5(n -1) ] 

So

3 + 5(n -1)    =   123

5 ( n -1)   =120

n - 1  =   24

n =  25th term