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In 1934, Romanoff proved that the set of positive integers representable as the sum of a prime and a power of two has positive lower density. Erdős later constructed an infinite arithmetic progression of odd integers none of which admits such a representation. Let be the Fibonacci sequence. In this paper, we prove that the set of integers of the form , where are primes and , has positive lower asymptotic density. The same holds for the set of integers not of this form.

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