239

This number is a prime.

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The number of composite-numbered days of the month in both leap years and non-leap years. [Homewood]

If A = 3, B = 5, C = 7, ... , Z = 137, using the regular prime alphabet, then 'PRIME' is a regular prime. [Homewood]

Roger Bannister ran the first sub 4 minute mile in 239 seconds. [Homewood]