# 47

This number is a prime.

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The forty-seventh Fibonacci and Lucas numbers are both
prime and are respectively 2971215073 and 6643838879.
Forty-seven represents the largest subscript less than one
hundred for which this is true. Among the first one hundred
Fibonacci numbers and Lucas numbers, both are prime for the
subscripts 4, 5, 7, 11, 13, 17, and 47. [Schiffman]
Submitted: 2010-11-01 08:48:00; Last Modified: 2010-11-13 18:21:41.

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