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