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9 Flips
abcdefghijkl
X 9
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lkjihgfedcba
Suppose that N is a positive number written base 10, and that 9xN has the same digits as N but is in a reversed order. Then we shall say for short that N is a 9-Flip.
Find all 9-flips with 12 digits
Is it possible to say exactly how many 9-flips there are with precisely n digits?
I've managed to find a few by trial and error.
108910891089, 109999999989, 108900001089
But still cant reason out why.
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