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Re: Nth Index of a Prime

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  • djbroadhurst
    ... Thanks, Jens! web.archive.org/web/20040125140056/http://www.cbau.freeserve.co.uk/ ... which seems to permit personal use. David
    Message 1 of 6 , Jul 13, 2010
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      --- In primenumbers@yahoogroups.com,
      "Jens Kruse Andersen" <jens.k.a@...> wrote:

      > Two years ago I searched for a good pi(x) program,
      > found an old mention of Christian Bau and dug up a link to
      > http://www.cbau.freeserve.co.uk [broken URL]

      Thanks, Jens!


      seems to be an appropriate archived URL. "PrimeCount.cp" says:

      > This code is unfinished work in progress. For this reason,
      > you may download this code and use it on the computer that
      > you used for downloading, but any further distribution is
      > strictly prohibited.

      which seems to permit personal use.

    • pbtoau
      Looks like Bau s code goes twice as high as Baugh s code and I don t have source code. The code the community needs is that developed by Tomás Oliveira e
      Message 2 of 6 , Jul 14, 2010
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        Looks like Bau's code goes twice as high as Baugh's code and I don't have source code. The code the community needs is that developed by Tomás Oliveira e Silva. His can go to at least 10^23. I have asked, but I guess not nicely enough.

        - David

        --- In primenumbers@yahoogroups.com, "djbroadhurst" <d.broadhurst@...> wrote:
        > --- In primenumbers@yahoogroups.com,
        > David Baugh <PbtoAu@> wrote:
        > > pi(1357911131197531) = 40159216312772
        > > The next one is too big for my implementation
        > How did you compute pi(x) with x > 10^15, please, David?
        > Andrew Booker's programme hosted at
        > http://primes.utm.edu/nthprime/
        > is restricted to pi(x) with x < 3*10^13.
        > For those with dollars to burn, Mma seems
        > able to compute pi(x) with x < 8*10^13:
        > http://mathworld.wolfram.com/PrimeCountingFunction.html
        > It seems that you have an implementation that
        > comfortably copes with x > 10^15.
        > Might you consider making your code available to
        > Chris Caldwell, for on-line use at the Prime Pages,
        > as Andrew generously did with his? If the data tables
        > are too big or the CPUtime too onerous for such on-line use,
        > might you kindly provide a source that others may compile?
        > Best regards
        > David Broadhurst
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