54018521
This number is a prime.
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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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