5309

This number is a prime.

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The sum of the first n composite numbers for n=6982 is 5309^2 (28185481). This is the third such square of a prime after 2^2 (n=1) and 7^2 (n=6). [Gaydos]

Submitted: 2017-11-15 15:34:04;   Last Modified: 2020-06-12 17:25:09.
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