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For quite some time now (at least a year), whenever I tried to use Plouffe's inverter, the request timed out, but there's no indication either on the site itself or on the Web that it's out of service or having problems. Does anyone know whether it's still online? Have I just been extremely unlucky?

Also, if it really is offline or practically unusable, do you know of any alternatives? I know OEIS, but that's for integer sequences, and its use for decimal representations of real numbers feels a bit unnatural (though it has quite a few sequences of that kind).

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  • $\begingroup$ Wolfram Alpha... $\endgroup$
    – Hans Lundmark
    Commented Oct 24, 2012 at 19:14
  • $\begingroup$ @Hans: Cool, I didn't know it does that :-) $\endgroup$
    – joriki
    Commented Oct 24, 2012 at 20:59
  • $\begingroup$ About 2 weeks ago, seeing such matters, I succeeded to find a substitute on the Internet. It worked fine. Now I'm trying to track it down again -- and I can't! I did not remember that working URL, because I thought the flaw at the original site was temporary. If I find the working software again, I'll share the URL with you. $\endgroup$
    – user51003
    Commented Nov 28, 2012 at 10:52
  • $\begingroup$ Heh. I guess you've cleared your cache since then? $\endgroup$
    – Simon Hayward
    Commented Nov 28, 2012 at 11:14
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    $\begingroup$ Additional Resources : RIES, Wolfram Alpha, the 'old' ISC. $\endgroup$
    – Raymond Manzoni
    Commented Apr 19, 2016 at 9:13

3 Answers 3

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Try one of these:

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  • $\begingroup$ Great, thanks, exactly what I was looking for! $\endgroup$
    – joriki
    Commented Nov 28, 2012 at 11:34
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    $\begingroup$ From the ISC+ site: The lookup tables include a substantial data set compiled by S. Plouffe both before and during his period as an employee at CECM. So it seems to be the legitimate successor to Plouffe's inverter. $\endgroup$
    – Christian Clason
    Commented Nov 28, 2012 at 13:07
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    $\begingroup$ The first link is dead, the second says it is down for maintanence indefinitely. $\endgroup$
    – user14717
    Commented May 21, 2020 at 16:03
  • $\begingroup$ @user14717, fixed, thanks for reporting $\endgroup$
    – lhf
    Commented May 21, 2020 at 17:05
  • $\begingroup$ Now the second one is down, but the first one still works. $\endgroup$
    – joriki
    Commented Mar 18, 2023 at 9:00
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I am told that the server it used to run on at UQAM doesn't exist anymore, and there are no plans to revive it there.

Edited to add: in response to a suggestion from me, the former Plouffe's Inverter site now admits that the Inverter no longer exists, and redirects users to the Inverse Symbolic Calculator Plus mentioned in the answer above.

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It seems that all the referenced websites are down, at least for the moment. However, I just noticed the following on Simon Plouffe's website:

2016 : Portable version of the Plouffe Inverter : Version portable de l'Inverseur de Plouffe. 3 billion entries at 32 digits precision.

This portable version can be accessed here.

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  • $\begingroup$ Thanks for this answer. But this seems to be just a set of directories with lots of text files with numbers in them. So I'd say it's not really a portable version of the inverter, just a data set that you can use to build your own inverter. $\endgroup$
    – joriki
    Commented Aug 29, 2016 at 6:25
  • $\begingroup$ @joriki Sure, but notice that the data is sorted by the associated real number, so it shouldn't be hard to look for expressions if you only need to make one or two queries. But anyway, it seems like isc+ is up! $\endgroup$
    – Bjarki Ágúst Guðmundsson
    Commented Sep 13, 2016 at 0:19
  • $\begingroup$ The link to the software is dead. $\endgroup$
    – user14717
    Commented May 21, 2020 at 15:52

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