We look at the division of 771604 by 51 
The aim is to understand the frequency of 51 in 771604.

Step 1:
When dividing 7 by 51, we get 0 with a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Append the next digit (7) from the dividend to 7 and continue with: 77 / 51

Step 2:
When dividing 77 by 51, we get 1 with a remainder of 26.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 51 from 77 to get 26.
Take the next digit (1) from the dividend and append it to 26, then repeat: 261 / 51

Going ahead to step 3:
261 divided by 51 is 5 with a remainder of 6.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
Subtracting 255 from 261 leaves us with 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 51

Going ahead to step 4:
51 goes into 66 1 times with a remainder of 15.
Record the quotient 1 as the next digit in the result. 
Result so far: 151.0
Subtract 51 from 66 to get 15.
Append the next digit (0) from the dividend to 15 and continue with: 150 / 51

Moving on to step 5:
51 can be fit into 150 2 times, resulting in a remainder of 48.
The next digit of our result is 2. 
Result so far: 1512.0
If we subtract 102 from 150, we get 48.
Fetch the next digit (4) from the dividend, attach it to 48 and continue: 484 / 51

Let's proceed to step 6:
484 divided by 51 is 9 with a remainder of 25.
The next digit of our result is 9. 
Result so far: 15129.0
If we subtract 459 from 484, 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.

Step 7:
250 divided by 51 is 4 with a remainder of 46.
Put 4 as the next digit of the answer. 
Result so far: 15129.4
Deduct 204 from 250 and we're left with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Moving on to step 8:
51 can be fit into 460 9 times, resulting in a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 15129.49
If we subtract 459 from 460, we 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.

Step 9:
10 divided by 51 is 0 with a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 15129.49
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 10:
If we divide 100 by 51, we get 1 and a remainder of 49.
The number 1 becomes the next digit in our result. 
Result so far: 15129.4901
Subtract 51 from 100 to get 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Let's proceed to step 11:
When dividing 490 by 51, we get 9 with a remainder of 31.
Record the quotient 9 as the next digit in the result. 
Result so far: 15129.49019
Subtracting 459 from 490 leaves us with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Moving on to step 12:
If we divide 310 by 51, we get 6 and a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 15129.490196
Deduct 306 from 310 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.

Moving on to step 13:
When dividing 40 by 51, we get 0 with a remainder of 40.
Record the quotient 0 as the next digit in the result. 
Result so far: 15129.490196
Deduct 0 from 40 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 14:
51 can be fit into 400 7 times, resulting in a remainder of 43.
Put 7 as the next digit of the answer. 
Result so far: 15129.49019607
If we take 357 away from 400, we end up with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

The final result is 15129.49019607 with a remainder of 4.3e-08.