10011...10011 (26-digits)

This number is a composite.

                                                100111 1001101111 0110110011

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

The smallest number that is prime for bases 2, 3, 4, 5, 6, 7, 8 and 9. [FitzHugh and Alpern]