131-Miraculous Constant 8181

 Miraculous Constant 8181

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The number 6174, well-known as the Kaprekar Constant, possesses unique mathematical characteristics that have captivated mathematicians for many years. Drawing inspiration from this idea, the Miraculous Constant 8181 is an astonishing numerical occurrence. This constant adherence to a specific iterative method uncovers concealed patterns and fascinating mathematical connections.

For any four-digit number that is made up of at least one differing digit, rearrange the digits as follows:
1)    Place the largest digit at the 1000’s place and the smallest digit at the 100’s place.
Out of the remaining 2 digits:
2)      Place the largest digit at the 10’s place and the smallest digit at the unit place.
Let's refer to this rearranged number as a Zigzag number.
Example: Let’s say the input number is 8492. Let’s form the Zigzag number from this.
Solution:
1)    The highest digit of the given number 8492 is 9, and the smallest digit is 2. So, the 1000’s placed digit of the Zigzag number will be 9, and the 100’s placed digit will be 2.
2) Now, we need to place the digits 8 and 4, with 8 being the greater and 4 being the smaller digit. Therefore, the 10’s place digit will be 8, and the units digit will be 4.
3) Therefore, the zigzag number of 8492 will be 9284.
4) Its reverse number will be 4829.

 In general, if the number is 1000a + 100b + 10c + d in which, a > b > c > d, ∀ a, b, c, d ∈ W, a set of whole numbers, then the Zigzag number will be 1000a + 100d + 10b + c and its reverse number is 1000c + 100b + 10d + a. At least one digit out of a, b, c, or d must be different from the others.
Now let us take the positive difference between the “Zigzag number” and the “reverse number”.
Repeat this process, called iteration, until you obtain the miraculous constant 8181.

Introduction

Kaprekar's constant is 6174. Our interest is in developing additional criteria to obtain the Miraculous Constant 8181. Let us take any 4-digit number with at least one different digit. We can take any number, such as 0001, which has 4 digits and one digit is different.

Method

Let us take any 4-digit number, 8492. Here, the largest digit is 9. So, the thousand-place digit will be 9. The smallest digit is 2, so the 100s place digit is 2. From 8492, digits 9 and 2 are being used, so the remaining digits are 8 and 4. To place a larger digit, 8 at the 10's place and 4 at the units place. So, our Zigzag number is 9284, and its reverse number is 4829, resulting in a positive difference.

Figure-1

The number of iterations for 8492 to get the Miraculous Constant 8181 is 8.

Here in iteration 3, the number 8181 is obtained. Again, from 8181 to reach 8181, we have 5 iterations, and they are fixed.