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Question: ithprime inverse?

Question:ithprime inverse?

David Sycamore 95 Maple
prime ithprime
September 01 2018
1

ithprime(n)  gives the unique prime whose index is n, thus ithprime(10) returns 29. Question: is there an inverse function in Maple, which given prime p would return n such that ithprime(n) = p?

Or if no such function exists can anyone suggest a way such a function could be coded?

Thanks in advance

David.
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