54018521

This number is a prime.

+ 54018521 represents the initial obstinate Lucas prime in the sense that it is not expressible as the sum of a prime and a power of two in at least one way and serves as the first counterexample in this Fibonacci-like sequence to de Polignac's conjecture. We note that 15127 is actually the initial obstinate composite Lucas number. [Schiffman]

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