66655...22221 (54-digits)
This number is a prime.
6665 5554466335 5226600551 1444433332 2440000331 1110022221
The largest prime obtained by laying down 27 valid domino pieces. Omitted piece 6-1. Found By G. Daddario. [Rivera]
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell