We look at the division of 16917476 by 721 
The aim is to understand the frequency of 721 in 16917476.

Going ahead to step 1:
721 goes into 1 0 times with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Bring next digit (6) of the dividend behind the 1 and repeat the process: 16 / 721

Going ahead to step 2:
721 goes into 16 0 times with a remainder of 16.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 16 leaves us with 16.
Grab the next digit (9) from the dividend, add it to 16, then carry on: 169 / 721

Going ahead to step 3:
721 goes into 169 0 times with a remainder of 169.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 169, we end up with 169.
Include the next digit (1) from the dividend after 169, then repeat: 1691 / 721

On to step 4:
The number 721 fits into 1691 2 times, leaving a remainder of 249.
The next digit of our result is 2. 
Result so far: 2.0
The remainder is 249 after subtracting 1442 from 1691.
Take the next digit (7) from the dividend and append it to 249, then repeat: 2497 / 721

Let's proceed to step 5:
721 can be fit into 2497 3 times, resulting in a remainder of 334.
Record the quotient 3 as the next digit in the result. 
Result so far: 23.0
Subtracting 2163 from 2497 leaves us with 334.
Append the next digit (4) from the dividend to 334 and continue with: 3344 / 721

Going ahead to step 6:
When dividing 3344 by 721, we get 4 with a remainder of 460.
Write down 4 as next digit of the result. 
Result so far: 234.0
If we subtract 2884 from 3344, we get 460.
Append the next digit (7) from the dividend to 460 and continue with: 4607 / 721

Let's proceed to step 7:
If we divide 4607 by 721, we get 6 and a remainder of 281.
Put 6 as the next digit of the answer. 
Result so far: 2346.0
If we take 4326 away from 4607, we end up with 281.
Fetch the next digit (6) from the dividend, attach it to 281 and continue: 2816 / 721

Let's proceed to step 8:
The number 721 fits into 2816 3 times, leaving a remainder of 653.
Put 3 as the next digit of the answer. 
Result so far: 23463.0
The remainder is 653 after subtracting 2163 from 2816.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6530, and continue the process.

Step 9:
If we divide 6530 by 721, we get 9 and a remainder of 41.
Put 9 as the next digit of the answer. 
Result so far: 23463.9
The remainder is 41 after subtracting 6489 from 6530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Let's proceed to step 10:
When dividing 410 by 721, we get 0 with a remainder of 410.
The number 0 becomes the next digit in our result. 
Result so far: 23463.9
Subtract 0 from 410 to get 410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4100, and continue the process.

On to step 11:
4100 divided by 721 is 5 with a remainder of 495.
Record the quotient 5 as the next digit in the result. 
Result so far: 23463.905
If we take 3605 away from 4100, we end up with 495.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4950, and continue the process.

Let's proceed to step 12:
The number 721 fits into 4950 6 times, leaving a remainder of 624.
The number 6 becomes the next digit in our result. 
Result so far: 23463.9056
The remainder is 624 after subtracting 4326 from 4950.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6240, and continue the process.

Let's proceed to step 13:
721 goes into 6240 8 times with a remainder of 472.
Use 8 as the next digit of our solution. 
Result so far: 23463.90568
If we take 5768 away from 6240, we end up with 472.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4720, and continue the process.

Advancing to step 14:
4720 divided by 721 is 6 with a remainder of 394.
Record the quotient 6 as the next digit in the result. 
Result so far: 23463.905686
Subtract 4326 from 4720 to get 394.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3940, and continue the process.

Moving on to step 15:
721 can be fit into 3940 5 times, resulting in a remainder of 335.
Record the quotient 5 as the next digit in the result. 
Result so far: 23463.9056865
If we subtract 3605 from 3940, we get 335.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3350, and continue the process.

Step 16:
3350 divided by 721 is 4 with a remainder of 466.
The number 4 becomes the next digit in our result. 
Result so far: 23463.90568654
If we take 2884 away from 3350, we end up with 466.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4660, and continue the process.

After the division, we end up with 23463.90568654 and a remainder of 4.66e-07.