4181

This number is a composite.

+ The smallest composite Fibonacci number not divisible by a Fibonacci prime. [Honaker]

+ The smallest composite Fibonacci number with a prime index. [Gupta]

+ 4181 is the smallest semiprime Fibonacci number whose reversal is a different semiprime. [Post]

+ The smallest Frobenius pseudoprime with respect to the Fibonacci polynomial x^2-x-1. [Luen]

+ The smallest semiprime Fibonacci number with emirp factors, i.e., 37 * 113. [Honaker]

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