1023

This number is a composite.

Just showing those entries submitted by 'Ganfield': (Click here to show all)

The smallest example of M(x), i.e., a Mersenne number, where M(x) = 3 * M(x/2) * p, where M(x/2) and p are prime. This is M(10) = 3 * M(5) * p, or 1023 = 3 * 31 * 11. [Ganfield]