We look at the division of 401273 by 1 
The aim is to understand the frequency of 1 in 401273.

Going ahead to step 1:
4 divided by 1 is 4 with a remainder of 0.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Subtract 4 from 4 to get 0.
Append the next digit (0) from the dividend to 0 and continue with: 0 / 1

On to step 2:
1 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 40.0
Subtracting 0 from 0 leaves us with 0.
Take the next digit (1) from the dividend and append it to 0, then repeat: 1 / 1

Step 3:
1 goes into 1 1 times with a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 401.0
If we take 1 away from 1, we end up with 0.
Include the next digit (2) from the dividend after 0, then repeat: 2 / 1

Advancing to step 4:
If we divide 2 by 1, we get 2 and a remainder of 0.
Write down 2 as next digit of the result. 
Result so far: 4012.0
If we take 2 away from 2, we end up with 0.
Take the next digit (7) from the dividend and append it to 0, then repeat: 7 / 1

On to step 5:
When dividing 7 by 1, we get 7 with a remainder of 0.
Use 7 as the next digit of our solution. 
Result so far: 40127.0
If we subtract 7 from 7, we get 0.
Grab the next digit (3) from the dividend, add it to 0, then carry on: 3 / 1

Going ahead to step 6:
The number 1 fits into 3 3 times, leaving a remainder of 0.
Write down 3 as next digit of the result. 
Result so far: 401273.0
Subtracting 3 from 3 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 7:
0 divided by 1 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 401273.0
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 8:
1 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 401273.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 401273.0 with a remaining 0.0.