4 ms·

What number comes next? The On-line Encyclopedia of Integer Sequences knows

• joe__f 3y ago
  I used to use the oeis when I was doing research in theoretical physics a few years back. I hadn't actually seen Neil Sloane before, I only knew his name from the website. I just watched some videos of him, he is really wonderful
• juliusgeo 3y ago
  Paywalled article, but I’m assuming it’s talking about the OEIS located here [0]. Such a cool resource, especially if you are trying to calculate S-boxes[1], or a lot of digits of an irrational number, or Bernoulli numbers or something. The links section for each sequence is super useful for initial research. [0] https://oeis.org https://oeis.org [1] https://oeis.org/A354500 https://oeis.org/A354500
• gilleain 3y ago
  Past discussion : https://news.ycombinator.com/item?id=26848517 https://news.ycombinator.com/item?id=26848517 Am I right in remembering that at one point the OEIS ran on a single machine that Neil Sloane ran himself? Personally, I used to use the database for counts of graphs (labelled vs unlablelled) and chemicals. Very useful and clear single-purpose tool.
• muti 3y ago
  http://archive.today/mguWA http://archive.today/mguWA
  • neonate 3y ago
    http://web.archive.org/web/20230523222110/https://www.nytimes.com/2023/05/21/science/math-puzzles-integer-sequences.html http://web.archive.org/web/20230523222110/https://www.nytime...
• nullc 3y ago
  I've solved many combinorica-ish problems by extracting a sequence from a numeric solution and then using OEIS to find generating formulas then figuring out which one was the right one.
  • fatneckbeard 3y ago
    interesting because in my experience Chat GPT has severe problems "understanding" OEIS so i wonder if it could solve the problems the way you did?
• tracerbulletx 3y ago
  That analogy about the FBI fingerprint database is one of the most tortured metaphors I've ever heard.
  • Georgelemental 3y ago
    I thought it was pretty good. You can solve a (mathematical/forensic) mystery by searching a database for information collected long ago, that relates to information you obtained just recently.
  • robertlagrant 3y ago
    The FBI would like to remind you that officially it's a "waterboarded" metaphor.
• ndsipa_pomu 3y ago
  I think the Neil Sloane Numberphile episodes are amongst my favourites (along with Cliff Stoll of course) and it's amazing that such a hobby project can become so useful. I think the appeal of his videos is that he introduces sequences as a type of game, draws you in and then later on, the interesting questions are introduced.
  • juliusgeo 3y ago
    Another comment in this thread mentioned that Neil Sloane now has his own channel, and is making some videos [0]. Very fun from that 20 minutes I've watched so far. [0] https://www.youtube.com/watch?v=9ogbsh8KuEM https://www.youtube.com/watch?v=9ogbsh8KuEM
• dang 3y ago
  Related. Others? Loda-lang – language, computational model, and OEIS miner - https://news.ycombinator.com/item?id=28639932 https://news.ycombinator.com/item?id=28639932 - Sept 2021 (14 comments) The Connoisseur of Number Sequences (2015) - https://news.ycombinator.com/item?id=27074978 https://news.ycombinator.com/item?id=27074978 - May 2021 (2 comments) The On-Line Encyclopedia of Integer Sequences - https://news.ycombinator.com/item?id=26848517 https://news.ycombinator.com/item?id=26848517 - April 2021 (31 comments) The On-Line Encyclopedia of Integer Sequences - https://news.ycombinator.com/item?id=21366618 https://news.ycombinator.com/item?id=21366618 - Oct 2019 (28 comments) Easter Egg in OEIS: Fur Elise in MIDI - https://news.ycombinator.com/item?id=20475896 https://news.ycombinator.com/item?id=20475896 - July 2019 (1 comment) The online encyclopaedia of integer sequences - https://news.ycombinator.com/item?id=18524115 https://news.ycombinator.com/item?id=18524115 - Nov 2018 (3 comments) 2, 3, 5,? Bell Labs (1968) [pdf] - https://news.ycombinator.com/item?id=18357229 https://news.ycombinator.com/item?id=18357229 - Nov 2018 (4 comments) The On-Line Encyclopedia of Integer Sequences [pdf] - https://news.ycombinator.com/item?id=18015493 https://news.ycombinator.com/item?id=18015493 - Sept 2018 (4 comments) OEIS submissions - https://news.ycombinator.com/item?id=17477542 https://news.ycombinator.com/item?id=17477542 - July 2018 (1 comment) The On-Line Encyclopedia of Integer Sequences - https://news.ycombinator.com/item?id=15900294 https://news.ycombinator.com/item?id=15900294 - Dec 2017 (1 comment) Pictures from the On-Line Encyclopedia of Integer Sequences - https://news.ycombinator.com/item?id=11711212 https://news.ycombinator.com/item?id=11711212 - May 2016 (5 comments) Play a Sequence - https://news.ycombinator.com/item?id=10445865 https://news.ycombinator.com/item?id=10445865 - Oct 2015 (3 comments) The Surprising Power of Neil Sloane’s Encyclopedia of Integer Sequences - https://news.ycombinator.com/item?id=10435690 https://news.ycombinator.com/item?id=10435690 - Oct 2015 (7 comments) An Interview with OEIS's Neil Sloane - https://news.ycombinator.com/item?id=10153589 https://news.ycombinator.com/item?id=10153589 - Sept 2015 (1 comment) The Connoisseur of Number Sequences - https://news.ycombinator.com/item?id=10045818 https://news.ycombinator.com/item?id=10045818 - Aug 2015 (1 comment) The Connoisseur of Number Sequences - https://news.ycombinator.com/item?id=10020831 https://news.ycombinator.com/item?id=10020831 - Aug 2015 (1 comment) The On-Line Encyclopedia of Integer Sequences - https://news.ycombinator.com/item?id=9919535 https://news.ycombinator.com/item?id=9919535 - July 2015 (19 comments) Neil Sloane: the man who loved only integer sequences - https://news.ycombinator.com/item?id=9380292 https://news.ycombinator.com/item?id=9380292 - April 2015 (2 comments) * The On-Line Encyclopedia of Integer Sequences* - https://news.ycombinator.com/item?id=6650490 https://news.ycombinator.com/item?id=6650490 - Oct 2013 (20 comments) The On-Line Encyclopedia of Integer Sequences - https://news.ycombinator.com/item?id=2496629 https://news.ycombinator.com/item?id=2496629 - April 2011 (7 comments) The On-Line Encyclopedia of Integer Sequences - https://news.ycombinator.com/item?id=888577 https://news.ycombinator.com/item?id=888577 - Oct 2009 (2 comments)
• optimalsolver 3y ago
  Shout out to my favorite integer sequence, The Recaman Numbers: https://www.youtube.com/watch?v=FGC5TdIiT9U https://www.youtube.com/watch?v=FGC5TdIiT9U
  • gilleain 3y ago
    ... which is https://oeis.org/A005132 https://oeis.org/A005132 ...
  • fatneckbeard 3y ago
    "and not already in the sequence" --> bound to be weirdness in that.
• deleted 3y ago
  [deleted]
• brian-armstrong 3y ago
  Does anyone know how it compares to the Cinco Encyclopedia of Numbers? Anyone have a recommendation for someone who might be new to numbers? https://youtu.be/rVtHrgdcvZA https://youtu.be/rVtHrgdcvZA
  • v64 3y ago
    cinco is a great resource, I'm on volume CCLXXIX and I'm still finding new numbers I've never even heard of like 2,737,829,283
    • bigpeopleareold 3y ago
      I just got into the 30,000,000 range. Literally riveting.
• codefined 3y ago
  I keep on meaning to finish a redesign of the oeis site that I started a few months ago[0]. I've only spent a day on it so far, but I'm hoping it makes the site far more approachable to new comers. [0] https://oeis.femto.dev/ https://oeis.femto.dev/
  • fathyb 3y ago
    I really like what you did, great work! Please post it whenever you feel it's ready. I'd love to see the code too.
    • codefined 3y ago
      Source code is available here[0]. Permissively licensed under MIT. [0] https://github.com/popey456963/pretty-oeis https://github.com/popey456963/pretty-oeis
  • Gunnerhead 3y ago
    I love this! You should continue!
  • Aardwolf 3y ago
    Some feedback: it lacks a search button. I mean, you can type a sequence, but have to hit the enter key to search. I'd expect at least some mouse-pressable button to be there that searches too (either the magnifying glass that's already there, or a button labeled "search"). You may say that "it's good enough you can press enter", however the site starts out already showing you the digit sequence "1, 2, 3, 6, 11" so you don't need the keyboard, but no way to actually search for it using only the mouse. Second feedback: it shows icons that look like a maple leaf in the top right without any explanation what it means, perhaps a tooltip could show what this maple leaf means? Idem for the other icons there. Third feedback: you have to individually click a full expand and then in addition expand all the subsections to view them... at least a dedicated page to entries should show everything immediately. Final most important feedback: it doesn't have individual URL's to the sequences anymore! That seems an important missing feature. It only shows results in ephemeral rendered boxes on the main page, no way to link to an individual entry! Clicking an entry should open its individual page. Middle mouse clicking should open it in a new tab like a real link does.
• fbrchps 3y ago
  The most important number sequence is of course in there. Simply search for 8,6,7,5 and you should find it.
  • amateurCoder5 3y ago
    There are 176 sequences that match 8,6,7,5. Which one did you mean?
• dvh 3y ago
  Anybody here who posted submission and received "less" tag?
• plank 3y ago
  Well, does the Encyclopedia knows what comes after 1,2,4,8,16? Hint: if you follow the Mathologer, you would know that there is a number different from 32…
  • tomsmeding 3y ago
    There are some non-32 hits if you search for this prefix. https://oeis.org/search?q=1%2C2%2C4%2C8%2C16&language=english&go=Search https://oeis.org/search?q=1%2C2%2C4%2C8%2C16&language=englis...
  • tgv 3y ago
    For a sequence of n numbers, fit an n-1 degree polynomial on (0, v_0), (1, v_1), ..., and compute for n. Doesn't even have to a polynomial. Any independent function base will do, I suppose. And who can contradict you? Doesn't really matter what "mathologer" thinks the next number is.
• erostrate 3y ago
  The following are real examples of submissions that were rejected: A-numbers of sequences contributed by [your name] (however, this might be appropriate on your OEIS Wiki user page). Experience points required for a Pokemon in the "erratic" experience group to be of level n. The year 10^n decimal digits of pi were first computed (Not well-defined!) Primes of the form n^3 + 2 n^2 + 37 n + 73. Non-trivial circulation in decreasing order: numbers of the form lim_{x->+inf}(a[x]b) with b<>1. You start at the number 1 and you add 2 until you get to the 4th number in the sequence, in which you then add the 1st and 3rd number of the sequence, which will give you 6. Then you do the same thing, adding 2 to each sequence, but for every 4th number you add the 1st and 3rd number before it. Consecutive Quotients minus a third term x(k) = fix(ax(k-1)/x(k-2))-bx(k-3). Prime numbers of the form 1 plus n x 10@r (@ means "to the power of") where n is an integer between 1 and 9 inclusive, and r is an integer greater than or equal to 0. Concatenate a semiprime with a Fibonacci number to obtain a palindrome with at least two distinct digits. The sequence 1,2,3 (and no further terms are known). The sequence 2,4,6 (and no further terms are known). From https://oeis.org/wiki/Examples_of_what_not_to_submit https://oeis.org/wiki/Examples_of_what_not_to_submit
  • float4 3y ago
    > Concatenate a semiprime with a Fibonacci number to obtain a palindrome with at least two distinct digits. For some reason, the thought that someone worked on this makes me very happy :)
• marie1595 3y ago
  [dead]
• Lewton 3y ago
  What to do if I've come up with an easily explainable number sequence that's not defined in the OEIS? It's a simple algorithm that's easy to perform with a deck of cards
  • jxf 3y ago
    There are an infinity of possible sequences you could write down. The ones in OEIS are ones where there's relevance to it in terms of other sequences or other mathematical ideas that make them useful to describe.
  • float4 3y ago
    You submit it to OEIS and it may be added. https://oeis.org/Submit.html https://oeis.org/Submit.html