47

This number is a prime.

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There are 47 occurrences of 47 in the first thousand prime numbers. [Faust]

47 is self-conscious: 4 + 7 = 11, 7 + 11 = 18, 11 + 18 = 29, and 18 + 29 = 47. It refers to itself. Note that 4, 7 and 47 are Lucas numbers. [Faust]