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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 <t5k.org> © G. L. Honaker and Chris K. Caldwell