5309
This number is a prime.
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]
(There is one curio for this number that has not yet been approved by an editor.)
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell