Algebra Level pending

Consider a sequence $$X$$ formed by adding the corresponding terms of the sequence of Prime numbers and Fibonacci numbers.

What is the difference between the $$nth$$ and $$(n-1)th$$ terms of the sequence $$X$$ ,where $$n$$ is the that term of the concernced sequence which is formed by adding a prime $$x$$ to the corresponding Fibonacci number.

$$x$$ is that prime number which is the first of it's kind to have a property of giving a composite number on reversing its digits.

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