I am Double Myself

I am a prime number.
The double of myself is equal to the square of me.

which number am I?




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[H 13 HSR]
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Tactical Math Riddle

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W

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5 10 ?

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Amazing Facts

No Solution

In 2007, a puzzle was released and $2 million prizes were offered for the first complete solution. The competition ended at noon on 31 December 2010, with no solution being found. Wiki