Historic links to the OEIS are of the form http://www.research.att.com/~njas/sequences/A097048. These links no longer work: Neil has retired from AT&T, and in the meantime has set up the OEIS foundation. The working form these days is http://oeis.org/A097048.

Should the old-form links be changed by some automated process, or should it be left to individuals to update their links as they find them? I don't know if there's a generic policy for broken links, and I don't know, even if there is one, if the same logic should apply to the general case as to this one - an important resource for which the link pattern has changed in a predictable (and hopefully final) manner.

(I noted this when revisiting the comments for What's the simplest rational not expressible as a sum of a given number of unit fractions?, but I assume there are numerous similar references on mathoverflow.)

Hugo van der Sanden

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    $\begingroup$ The example you point out is in a comment (of mine), and my understanding is that only moderators can edit comments. $\endgroup$ Oct 28, 2013 at 3:14
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    $\begingroup$ Could Stack Exchange staff have these all automatically fixed? $\endgroup$ Oct 28, 2013 at 13:56
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    $\begingroup$ I think that when we moved to 2.0 we gained the power to edit our own comments. Not sure if we can edit old comments of ours from before the migration, though. At least, I can't see how to do it. $\endgroup$ Oct 28, 2013 at 15:15
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    $\begingroup$ @David: Nonmoderators can only edit comments within 5 minutes of posting them. $\endgroup$ Oct 28, 2013 at 15:16
  • $\begingroup$ Okay, good to know. Thanks $\endgroup$ Oct 28, 2013 at 15:17
  • $\begingroup$ To find posts and comments respectively that point to the old address, see data.stackexchange.com/mathoverflow/query/1543589/… data.stackexchange.com/mathoverflow/query/1543626/… $\endgroup$ Jan 19, 2022 at 11:56

1 Answer 1


For reference, here are the pages that Google knows use the old domain.

If people have strong feelings, they can fix those they want to and remove them from this list. For comments, a follow-up comment pointing out the new url will probably be sufficient.





https://mathoverflow.net/a/18639/ (and comment Number of invertible {0,1} real matrices?)

Can you find linear recurrence relation for dimensions of invariant tensors?



https://mathoverflow.net/a/44247/ (and comment Count of lattices on finite set)


https://mathoverflow.net/a/29179/ https://mathoverflow.net/a/39134/





Number of non-Abelian groups of order $2^n$ (and comment, Number of non-Abelian groups of order $2^n$)


https://mathoverflow.net/a/40421/ (plus comment number of partial orders modulo a fixed number)

How good is Kamenetsky's formula for the number of digits in n-factorial?


Describe a tree by junctions

A binomial generalization of the FLT: Bombieri's Napkin Problem (and https://mathoverflow.net/a/27425/4177)

Can a positive binary quadratic form represent 14 consecutive numbers?




https://mathoverflow.net/a/44194/ (plus comment How many simply connected subsets of an n-by-m grid?)



Not OEIS, but still links to Slaone's AT & T homepage




Same, but in commeants

Prove: if a1,...,an are uniformly distributed unit vectors, then a1*a1'+...+an*an'=n/2*I (should be to http://neilsloane.com/sphdesigns/) How small can a sum of a few roots of unity be? (should be to http://neilsloane.com/doc/1218anti.ps)

Covering a unit ball with balls half the radius (should be to http://neilsloane.com/coverings/)

Root systems and sums of squares (should to http://www.math.rwth-aachen.de/~Gabriele.Nebe/LATTICES/E6.html, http://www.math.rwth-aachen.de/~Gabriele.Nebe/LATTICES/E7.html and http://www.math.rwth-aachen.de/~Gabriele.Nebe/LATTICES/E8.b.html)

What is the largest possible thirteenth kissing sphere? (should be to http://neilsloane.com/packings/index.html)

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    $\begingroup$ Feeling obsessive compulsive, I did most of the comments. $\endgroup$ Oct 28, 2013 at 5:24
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    $\begingroup$ You think you were obsessive-compulsive? I used the 'share' link on each question/answer to get the above list, manually (and trimmed the comments to links to short-form) ... ^_^ $\endgroup$
    – David Roberts Mod
    Oct 28, 2013 at 6:17
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    $\begingroup$ And I moved the others under the correct heading (wasn't looking close enough when I pasted those ones in). $\endgroup$
    – David Roberts Mod
    Oct 28, 2013 at 6:20
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    $\begingroup$ @Scott more for you... $\endgroup$
    – David Roberts Mod
    Oct 28, 2013 at 6:22
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    $\begingroup$ Thanks for the list - I'd guessed there would be more, but for these numbers I guess hand-editing is fine (accepting some "omg, something changed" front-page churn). $\endgroup$ Oct 28, 2013 at 19:32
  • $\begingroup$ The striked ones are flooding the list? Could I remove them?. $\endgroup$ Oct 29, 2013 at 12:08
  • $\begingroup$ I moved the struck out ones down the page. @ScottMorrison - there are still four comments that need editing, if you feel so inclined. $\endgroup$
    – David Roberts Mod
    Oct 29, 2013 at 22:26
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    $\begingroup$ @DImension10AbhimanyuPS - I changed the WayBack machine links that you inserted to arxiv/neilsloane.com links. $\endgroup$
    – David Roberts Mod
    Oct 29, 2013 at 22:46
  • $\begingroup$ I also tracked down the other links to non-OEIS pages that need to be inserted into comments. $\endgroup$
    – David Roberts Mod
    Oct 29, 2013 at 22:47
  • $\begingroup$ @ScottMorrison - thanks! $\endgroup$
    – David Roberts Mod
    Oct 30, 2013 at 3:12
  • $\begingroup$ I found one of my questions with a link to Sloane's AT&T page that was not listed above. mathoverflow.net/questions/18636/… I edited it in. Can someone explain how they are searching for the culprits? $\endgroup$
    – Tony Huynh
    Oct 30, 2013 at 16:05
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    $\begingroup$ You can probably get Scott Morrison's help to make an SQL query on the data explorer to find most occurrences. Gerhard "Or Grep A Database Dump" Paseman, 2013.10.30 $\endgroup$ Oct 30, 2013 at 23:47
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    $\begingroup$ "Grep a database dump" sounds vaguely sinister, or at the very least quite unsanitary. $\endgroup$ Oct 31, 2013 at 6:30
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    $\begingroup$ @ScottMorrison: A quick google search using the term site:mathoverflow.net njas still seems to give comments whose links are broken e.g. mathoverflow.net/q/36188/16302 and mathoverflow.net/q/16780/16302. $\endgroup$
    – jeq
    Nov 10, 2013 at 21:49
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    $\begingroup$ BTW it seems rather unusual to me that this is marked (status-completed) when there is plenty of posts (and comments) on the main site with the old domain. $\endgroup$ Aug 15, 2019 at 8:13

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