25

This number is a composite.

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A prime square whose prime count π(5^2) is another prime square (3^2) and it's prime count is another prime square (π(π(5^2)) = 2^2). [Picheny]

Submitted: 2009-07-24 16:24:43;   Last Modified: 2009-07-24 18:39:50.
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