We look at the division of 15649909 by 71 
The aim is to understand the frequency of 71 in 15649909.

Going ahead to step 1:
When dividing 1 by 71, we get 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 71

Going ahead to step 2:
71 goes into 15 0 times with a remainder of 15.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 15 to get 15.
Include the next digit (6) from the dividend after 15, then repeat: 156 / 71

Moving on to step 3:
156 divided by 71 is 2 with a remainder of 14.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Deduct 142 from 156 and we're left with 14.
Bring next digit (4) of the dividend behind the 14 and repeat the process: 144 / 71

Let's proceed to step 4:
144 divided by 71 is 2 with a remainder of 2.
Record the quotient 2 as the next digit in the result. 
Result so far: 22.0
If we subtract 142 from 144, we get 2.
Fetch the next digit (9) from the dividend, attach it to 2 and continue: 29 / 71

Step 5:
71 goes into 29 0 times with a remainder of 29.
The number 0 becomes the next digit in our result. 
Result so far: 220.0
If we subtract 0 from 29, we get 29.
Bring next digit (9) of the dividend behind the 29 and repeat the process: 299 / 71

On to step 6:
299 divided by 71 is 4 with a remainder of 15.
Put 4 as the next digit of the answer. 
Result so far: 2204.0
If we take 284 away from 299, we end up with 15.
Append the next digit (0) from the dividend to 15 and continue with: 150 / 71

Let's proceed to step 7:
If we divide 150 by 71, we get 2 and a remainder of 8.
The next digit of our result is 2. 
Result so far: 22042.0
The remainder is 8 after subtracting 142 from 150.
Append the next digit (9) from the dividend to 8 and continue with: 89 / 71

On to step 8:
When dividing 89 by 71, we get 1 with a remainder of 18.
Write down 1 as next digit of the result. 
Result so far: 220421.0
If we take 71 away from 89, we end up with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 9:
180 divided by 71 is 2 with a remainder of 38.
Record the quotient 2 as the next digit in the result. 
Result so far: 220421.2
Subtract 142 from 180 to get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Going ahead to step 10:
The number 71 fits into 380 5 times, leaving a remainder of 25.
Use 5 as the next digit of our solution. 
Result so far: 220421.25
If we subtract 355 from 380, we get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Moving on to step 11:
71 goes into 250 3 times with a remainder of 37.
Use 3 as the next digit of our solution. 
Result so far: 220421.253
If we subtract 213 from 250, we get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Step 12:
71 goes into 370 5 times with a remainder of 15.
The next digit of our result is 5. 
Result so far: 220421.2535
Subtract 355 from 370 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 13:
71 can be fit into 150 2 times, resulting in a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 220421.25352
The remainder is 8 after subtracting 142 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 14:
When dividing 80 by 71, we get 1 with a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 220421.253521
Subtract 71 from 80 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 15:
When dividing 90 by 71, we get 1 with a remainder of 19.
Record the quotient 1 as the next digit in the result. 
Result so far: 220421.2535211
The remainder is 19 after subtracting 71 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

The final outcome is 220421.2535211, with a leftover of 1.9e-07.