We look at the division of 155901 by 17 
The aim is to understand the frequency of 17 in 155901.

On to step 1:
If we divide 1 by 17, we get 0 and a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Include the next digit (5) from the dividend after 1, then repeat: 15 / 17

Moving on to step 2:
The number 17 fits into 15 0 times, leaving a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 15 to get 15.
Take the next digit (5) from the dividend and append it to 15, then repeat: 155 / 17

Let's proceed to step 3:
If we divide 155 by 17, we get 9 and a remainder of 2.
Use 9 as the next digit of our solution. 
Result so far: 9.0
Subtract 153 from 155 to get 2.
Fetch the next digit (9) from the dividend, attach it to 2 and continue: 29 / 17

On to step 4:
17 goes into 29 1 times with a remainder of 12.
The number 1 becomes the next digit in our result. 
Result so far: 91.0
If we take 17 away from 29, we end up with 12.
Include the next digit (0) from the dividend after 12, then repeat: 120 / 17

Going ahead to step 5:
When dividing 120 by 17, we get 7 with a remainder of 1.
Write down 7 as next digit of the result. 
Result so far: 917.0
The remainder is 1 after subtracting 119 from 120.
Take the next digit (1) from the dividend and append it to 1, then repeat: 11 / 17

Going ahead to step 6:
When dividing 11 by 17, we get 0 with a remainder of 11.
The number 0 becomes the next digit in our result. 
Result so far: 9170.0
Subtracting 0 from 11 leaves us with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 7:
17 can be fit into 110 6 times, resulting in a remainder of 8.
Record the quotient 6 as the next digit in the result. 
Result so far: 9170.6
Subtract 102 from 110 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 8:
If we divide 80 by 17, we get 4 and a remainder of 12.
Write down 4 as next digit of the result. 
Result so far: 9170.64
If we subtract 68 from 80, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 9:
17 goes into 120 7 times with a remainder of 1.
Use 7 as the next digit of our solution. 
Result so far: 9170.647
Deduct 119 from 120 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 10:
10 divided by 17 is 0 with a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 9170.647
Subtracting 0 from 10 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 11:
17 goes into 100 5 times with a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 9170.64705
The remainder is 15 after subtracting 85 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 12:
150 divided by 17 is 8 with a remainder of 14.
Use 8 as the next digit of our solution. 
Result so far: 9170.647058
The remainder is 14 after subtracting 136 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 13:
If we divide 140 by 17, we get 8 and a remainder of 4.
The next digit of our result is 8. 
Result so far: 9170.6470588
Deduct 136 from 140 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The final result is 9170.6470588 with a remainder of 4e-08.