10
This number is a composite.
Just showing those entries submitted by 'Green': (Click here to show all)
In the year '10 of this (or any) century, a person born in
'73 of the previous century will be 37 and a person born in
'37 will be 73. This pattern is true of many different
years and ages, but this is the only pattern represented by
two emirps. [Green]
(There is one curio for this number that has not yet been approved by an editor.)
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