We look at the division of 18688 by 17 
The aim is to understand the frequency of 17 in 18688.

On to step 1:
The number 17 fits into 1 0 times, leaving a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Take the next digit (8) from the dividend and append it to 1, then repeat: 18 / 17

Moving on to step 2:
When dividing 18 by 17, we get 1 with a remainder of 1.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 17 from 18 leaves us with 1.
Append the next digit (6) from the dividend to 1 and continue with: 16 / 17

Going ahead to step 3:
16 divided by 17 is 0 with a remainder of 16.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
The remainder is 16 after subtracting 0 from 16.
Include the next digit (8) from the dividend after 16, then repeat: 168 / 17

Going ahead to step 4:
The number 17 fits into 168 9 times, leaving a remainder of 15.
Record the quotient 9 as the next digit in the result. 
Result so far: 109.0
If we subtract 153 from 168, we get 15.
Fetch the next digit (8) from the dividend, attach it to 15 and continue: 158 / 17

Step 5:
158 divided by 17 is 9 with a remainder of 5.
Record the quotient 9 as the next digit in the result. 
Result so far: 1099.0
Subtracting 153 from 158 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 6:
When dividing 50 by 17, we get 2 with a remainder of 16.
The number 2 becomes the next digit in our result. 
Result so far: 1099.2
The remainder is 16 after subtracting 34 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Advancing to step 7:
The number 17 fits into 160 9 times, leaving a remainder of 7.
Use 9 as the next digit of our solution. 
Result so far: 1099.29
Subtracting 153 from 160 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 8:
17 goes into 70 4 times with a remainder of 2.
Use 4 as the next digit of our solution. 
Result so far: 1099.294
If we take 68 away from 70, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 9:
The number 17 fits into 20 1 times, leaving a remainder of 3.
Use 1 as the next digit of our solution. 
Result so far: 1099.2941
Subtracting 17 from 20 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 10:
17 goes into 30 1 times with a remainder of 13.
Use 1 as the next digit of our solution. 
Result so far: 1099.29411
Deduct 17 from 30 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

The final outcome is 1099.29411, with a leftover of 1.3e-05.