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No: 04       August 14, 2019


ROTATED NUMBER

ROTATED NUMBER

The digital digits 0,1,2,5,6,8,9 are also digits when they are rotated 180 degrees (0-->0,
1-->1, 2-->2, 5-->5, 6-->9,
8-->8, 9-->6). Let’s call the numbers that only these digits are used as “Rotated Numbers”.

What is the largest rotated number having all the digits different and the result is also a rotated number when its rotation is subtracted from itself?

Example: 9028 is such a number (9028-8206=822).


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