We look at the division of 641579 by 41 
The aim is to understand the frequency of 41 in 641579.

Moving on to step 1:
41 goes into 6 0 times with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 41

Moving on to step 2:
When dividing 64 by 41, we get 1 with a remainder of 23.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 41 from 64 and we're left with 23.
Append the next digit (1) from the dividend to 23 and continue with: 231 / 41

Advancing to step 3:
When dividing 231 by 41, we get 5 with a remainder of 26.
The next digit of our result is 5. 
Result so far: 15.0
Deduct 205 from 231 and we're left with 26.
Fetch the next digit (5) from the dividend, attach it to 26 and continue: 265 / 41

On to step 4:
If we divide 265 by 41, we get 6 and a remainder of 19.
Put 6 as the next digit of the answer. 
Result so far: 156.0
If we subtract 246 from 265, we get 19.
Include the next digit (7) from the dividend after 19, then repeat: 197 / 41

Let's proceed to step 5:
If we divide 197 by 41, we get 4 and a remainder of 33.
Record the quotient 4 as the next digit in the result. 
Result so far: 1564.0
If we subtract 164 from 197, we get 33.
Bring next digit (9) of the dividend behind the 33 and repeat the process: 339 / 41

Moving on to step 6:
41 goes into 339 8 times with a remainder of 11.
Put 8 as the next digit of the answer. 
Result so far: 15648.0
Deduct 328 from 339 and we're left 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 41, we get 2 with a remainder of 28.
Use 2 as the next digit of our solution. 
Result so far: 15648.2
Subtracting 82 from 110 leaves us with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Advancing to step 8:
When dividing 280 by 41, we get 6 with a remainder of 34.
Write down 6 as next digit of the result. 
Result so far: 15648.26
Subtract 246 from 280 to get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Advancing to step 9:
When dividing 340 by 41, we get 8 with a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 15648.268
Subtracting 328 from 340 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.

Going ahead to step 10:
The number 41 fits into 120 2 times, leaving a remainder of 38.
The number 2 becomes the next digit in our result. 
Result so far: 15648.2682
If we subtract 82 from 120, we 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.

Advancing to step 11:
41 can be fit into 380 9 times, resulting in a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 15648.26829
If we take 369 away from 380, 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.

Advancing to step 12:
41 can be fit into 110 2 times, resulting in a remainder of 28.
The number 2 becomes the next digit in our result. 
Result so far: 15648.268292
If we subtract 82 from 110, we get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Let's proceed to step 13:
280 divided by 41 is 6 with a remainder of 34.
The next digit of our result is 6. 
Result so far: 15648.2682926
Subtract 246 from 280 to get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Step 14:
If we divide 340 by 41, we get 8 and a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 15648.26829268
Subtract 328 from 340 to 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.

After the division, we end up with 15648.26829268 and a remainder of 1.2e-08.