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From: Paul Rubin <no.email@nospam.invalid>
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Subject: Re: Fast multi byte read and write words
Date: Fri, 27 Nov 2015 10:23:41 -0800
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Bernd Paysan <bernd.paysan@gmx.de> writes:
> Probably a precomputed answer.

No you can ask for pi(x) for arbitrary x in that range, and get the
answer pretty quick.  The Wikipedia page gives algorithms that should be
able to do it.