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 21:34:04; Last Modified: 2020-06-12 22:25:09.
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