512

This number is a composite.

Single Curio View: (Seek other curios for this number)

512 = 2^9. Both 2^9 +/- 9^2 are prime. This is the smallest number of the form 2^n such that both 2^n +/- n^2 are prime. [Astle]

Submitted: 2004-09-02 20:02:40; Last Modified: 2008-01-30 17:28:00.