The following are two of the mathematical BLACK HOLES...
The Sisyphus String: 123
Suppose we start with any natural number, regarded as a string, such
Count the number of even digits, the number of odd digits, and the
total number of digits. These are 3 (three evens), 4 (four odds), and
7 (total of seven digits). So, use these digits to form the next
string or number, 347.
Now repeat with 347, counting evens, odds, total number, to get 1, 2,
3, so write down 123.
If we repeat with 123, we get 123 again.
The number 123 with respect to this process and universe of numbers is
a mathematical black hole.
All numbers in this universe are drawn to 123 by this process, never to escape.
Will every number really be sent to 123? Try
The numbers of evens, odds, and total are 20, 25, and 45,
respectively. So, our next iterate is 202545, the number obtained from
20, 25, 45. Iterating for 202545 we find 4, 2, and 6 for evens, odds,
total, so we have 426 now. One more iteration using 426 produces 303,
and a final iteration from 303 produces 123.
Kaprekar's constant (number): 6174
Process in this can be described as follows.
Take any four digit number with distinct digit, form a number by
arranging these digits in ascending order and subtract this number
from a number formed by arranging same digits in descending order. Now
repeat the procedure on the subtraction. You will finally reach to
eg. Take no. 1234
4321 - 1234 = 3087
8730 - 0378 = 8352
8532 - 2358 = 6174
7641 - 1467 = 6174
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