47

This number is a prime.

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According to Chinese legend, a 16th century official named Wan Hu attempted a flight to the Moon by using two kites fastened to a sedan chair on which he had strapped 47 black powder rockets. 47 servants simultaneously lit the fuses and Wan Hu disappeared in a burst of flame and smoke. A crater on the far side of the Moon (at 9.8°S, 138.8°W) has been named in his honor. [Caldwell]