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[ September 28, 2013 ]
A question about ninedigitals
by Mike Fairley (email)

Can someone please explain why 123456789 multiplied by 2 has
every digit (246913578) and divided by 2 also has every digit
(61728394.5) and one can continue to multiply by 2 or divide by 2
for a few more times and the result always has every digit.

Is this common knowledge or does it have a simple mathematical
proof which is eluding me?
I am wondering if someone may have a simple mathematical explanation.

A000185 Prime Curios! Prime Puzzle
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