Posts tagged Numberphile
PARALLEL (SIMON SINGH): Kaprekar constant
  • Pick any 4 digit number (as long as the digits are not ALL the same).

  • Put the digits in ascending order and descending order to create two numbers.

  • Subtract the small number from the big number, to create a next stage number.

  • Then repeat the process with the new number

  • Eventually you end up with 6,174.

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