1849
This number is a composite.
The largest known square-semiprime that is the sum of the first n odd primes
(3+5+7+...+127+131=1849). [Bajpai]
The smallest square that is the sum of first n Sophie
Germain primes (2+3+5+11+...+239+251=1849). [Bajpai]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell