211151

This number is a prime.

+ The smallest "Xmas Tree Prime" with 3 rows, i.e., 6 digits. [Trotter]

+ The smallest prime formed from the concatenation in order of a single-digit, a double-digit and a 3-digit primes, i.e., 2, 11, 151. [Loungrides]

Printed from the PrimePages <primes.utm.edu> © G. L. Honaker and Chris K. Caldwell