1123

This number is a prime.

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11/23 (November 23) is the only date containing the concatenation of two 2-digit primes that can be read as a prime number in either "month-day" or "day-month" format, i.e., 11/23 or 23/11. Note that Kinro Kansha no Hi (Labor-Thanksgiving Day) occurs on this date in Japan. [Kik]