3

This number is a prime.

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3 is the only known power of 3 (i.e., 3^3 = 27) whose digits do not contain a power of 3 (i.e., 1, 3, and 9). [Gupta]

Submitted: 2026-02-02 14:06:53; Last Modified: 2026-02-02 14:35:41.