22111...66661 (51-digits)

This number is a prime.

                    2 2111133004 4115522223 3334422663 3555544446 6005566661

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

The smallest prime obtained by laying down 27 valid domino pieces. Omitted piece 0-1. Found by G. Daddario. [Rivera]