6174

@smania0711

Select any four digit number (not repdigit). Arrange the digits in descending (n') and ascending (n''). Then, compute n'-n''. Repeat this routine.

FAXX灰鳥って11未鳥12!!!ヒャッハァァァァァァァァ!!!

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1470 days ago

FAXX灰鳥って11未鳥12!!!ヒャッハァァァァァァァァ!!!

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