25,25,7,28,29,20,21,22,23,14,35,26,7,28,29,20,16,29,12,15,28,21,14,17,30,13,16,29,12,15,28,21,10,6,12,18,15,11,7,13,19,17,13,9,15,21,18,14,10,16,22,19,15,11,17,23,20,16,12,18,24,21,17,13,19,25,23,19,15,21,27,24,20,16,22,28,25,21,17,23,29,16,13,9,15,21,18,14,10,16,22,20,16,12,18,24,21,17,13,19

The length of the lines are 5 (because 1*5 + 1-1 = 5):
12345
67891(0)

Then leave the digits in an Olympic Rings pattern:
1 3 5
 7 9

And sum them:
1+3+5+7+9 = 25

The length of the lines are 11 (because 2*5 + 2-1 = 11):
12345678910
11121314151(6)

Then leave the digits in the second/right-most Olympic Rings pattern:
      7 9 0
       4 5

And sum them:
7+9+0+4+5 = 25

The length of the lines are 17 (because 3*5 + 3-1 = 17):
12345678910111213
14151617181920212(2)

Then leave the digits in the third/right-most Olympic Rings pattern:
            1 2 3
             0 1

And sum them:
1+2+3+0+1 = 7

1010:   24
1011:   24
2500:   19
5000:   23
7500:   8
10000:  8
100000: 25