919

This number is a prime.

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This prime is the 18th centered hexagonal number. Note that we can use the digits of 919 to write 18 = (9 * 1) + 9 = 9 + (1 * 9). [Post]

Submitted: 2004-10-06 10:30:51; Last Modified: 2008-01-30 17:28:00.