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Duplicate Digit Determination (
Posted on 20061203
)
If 2^P and 5^P start with the same (nonzero) digit for positive integer P, what is that digit? Can you prove it must be so?
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Old Original Oskar!
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An easy way out
 Comment 4 of 6 
Given that 2^5=32 and 5^5=3125 both start with 3,
if there is a single answer to this problem
, it must be "3".
Posted by
Federico Kereki
on 20061203 17:51:41
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