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The On-Line Encyclopedia of Integer Sequences

16 pointsby harporoederalmost 2 years ago

2 comments

Terr_almost 2 years ago
As someone without a math-degree, OEIS has been surprisingly great just for helping bridge &quot;my unscalable brute force test program spit out these numbers&quot; to &quot;oh, <i>that&#x27;s</i> what what this kinda thingy is called and what class of problem it is.&quot;<p>Let me give you a concrete example, back from some online puzzle by a Large Internet Search company. You have X items of unique heights, and the question is how many ways you can line them up so that someone looking from one end can see Y distinct non-occluded heights, and someone looking from the other side can see Z distinct heights.<p>IIRC manually experimenting with small numbers revealed a pattern that OEIS said was Stirling Numbers of the first kind [0]. Simply having this jargon&#x2F;label available made it possible to access work other people did on it in the past.<p>[0] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Stirling_numbers_of_the_first_kind" rel="nofollow noreferrer">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Stirling_numbers_of_the_first_...</a>
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MetaMonkalmost 2 years ago
A new sequence should be added to the OEIS that comprises the unix timestamps of each individual submission of the OEIS to HN.<p><a href="https:&#x2F;&#x2F;hn.algolia.com&#x2F;?dateRange=all&amp;query=The%20On-Line%20Encyclopedia%20of%20Integer%20Sequences&amp;sort=byDate" rel="nofollow noreferrer">https:&#x2F;&#x2F;hn.algolia.com&#x2F;?dateRange=all&amp;query=The%20On-Line%20...</a>