338957 divided by 17 
The aim is to understand the frequency of 17 in 338957.

Moving on to step 1:
The number 17 fits into 3 0 times, leaving a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Take the next digit (3) from the dividend and append it to 3, then repeat: 33 / 17

Moving on to step 2:
If we divide 33 by 17, we get 1 and a remainder of 16.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 17 from 33, we get 16.
Fetch the next digit (8) from the dividend, attach it to 16 and continue: 168 / 17

Step 3:
17 goes into 168 9 times with a remainder of 15.
Record the quotient 9 as the next digit in the result. 
Result so far: 19.0
Subtracting 153 from 168 leaves us with 15.
Append the next digit (9) from the dividend to 15 and continue with: 159 / 17

Let's proceed to step 4:
17 can be fit into 159 9 times, resulting in a remainder of 6.
Record the quotient 9 as the next digit in the result. 
Result so far: 199.0
Subtract 153 from 159 to get 6.
Grab the next digit (5) from the dividend, add it to 6, then carry on: 65 / 17

Step 5:
If we divide 65 by 17, we get 3 and a remainder of 14.
Put 3 as the next digit of the answer. 
Result so far: 1993.0
The remainder is 14 after subtracting 51 from 65.
Grab the next digit (7) from the dividend, add it to 14, then carry on: 147 / 17

Moving on to step 6:
17 can be fit into 147 8 times, resulting in a remainder of 11.
Write down 8 as next digit of the result. 
Result so far: 19938.0
If we take 136 away from 147, we end up 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:
When dividing 110 by 17, we get 6 with a remainder of 8.
The number 6 becomes the next digit in our result. 
Result so far: 19938.6
Deduct 102 from 110 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 8:
17 goes into 80 4 times with a remainder of 12.
Put 4 as the next digit of the answer. 
Result so far: 19938.64
Subtracting 68 from 80 leaves us with 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:
If we divide 120 by 17, we get 7 and a remainder of 1.
The number 7 becomes the next digit in our result. 
Result so far: 19938.647
Subtract 119 from 120 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 10:
17 goes into 10 0 times with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 19938.647
Subtract 0 from 10 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 11:
100 divided by 17 is 5 with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 19938.64705
Deduct 85 from 100 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 12:
17 goes into 150 8 times with a remainder of 14.
Use 8 as the next digit of our solution. 
Result so far: 19938.647058
Deduct 136 from 150 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 13:
The number 17 fits into 140 8 times, leaving a remainder of 4.
The next digit of our result is 8. 
Result so far: 19938.6470588
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 outcome is 19938.6470588, with a leftover of 4e-08.