Question: ithprime function

If you type ithprime (10^7) and hit return, the answer 179424673 is returned instantaneously, but if you do ithprime(10^8) there is no answer in ~ one hour plus (and maybe never), it just says “evaluating” and no answer comes. I have done calculations in Maple where the answer was a prime with ~18,000 digits yet cannot get beyond ithprime(10^7) when writing a code that needs to work up the prime list, looking for a particular one. Has anyone else encountered this apparent limitation in Maple?

Is there a way around it? 

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