31

This number is a prime.

Single Curio View:   (Seek other curios for this number)
After removing two opposing corner squares on a chessboard it is impossible to arrange 31 dominoes in such a way that they cover all the remaining squares.

Submitted: 2004-08-03 03:42:52;   Last Modified: 2008-02-11 20:43:54.
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell