Wikipedia:Reference desk/Archives/Mathematics/2018 February 23

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February 23

Is there a version of OEIS that also shows categories of number that don't show up when you type nothing but seq:xxxx?

If I type a low 4-digit prime it doesn't actually show all sequences that contain it since if I sort by sequence number the first hit's not A000040 or below. Is there something that's nearly exhaustive for natural numbers of this size? (it probably can't be completely exhaustive since some combinations of "natural numbers no bigger than this" and "sequences" would probably need prohibitive or infinite computing time to check) Sagittarian Milky Way (talk) 22:54, 23 February 2018 (UTC)

To clarify perhaps, if you type 4567 into the search you want to find all OEIS sequences which contain 4567. But A000040 (the sequence of primes) is not showing in the search results since the list stored in OEIS only goes to 271. Afaik you don't have an extended search option in OEIS which allows you to search beyond what's actually stored on the database, and OEIS is pretty unique so I'm pretty sure you won't find a similar database that does have that option. (I'm guessing such an option wouldn't be feasible even if you did make reasonable restrictions such as excluding hard to compute sequences.) Not sure why you want this, but you might try to find a different approach to the problem or try typing 4567 into Wolfram Alpha. --RDBury (talk) 00:36, 24 February 2018 (UTC)

Some of the sequences have an additional table of the first 1,000 or 10,000 terms, but I don't know if it searches them (probably not), and probably most sequences don't have the table. Bubba73 ^{You talkin' to me?} 02:04, 24 February 2018 (UTC)