oeis2: Interface for Online Encyclopedia of Integer Sequences (OEIS).

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Versions [RSS] 0.1.0, 1.0.0, 1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5, 1.0.6, 1.0.7, 1.0.8
Dependencies aeson (>=2 && <3), base (>=4.17 && <5), containers (>=0.5 && <0.7), http-conduit (>=2.2 && <3), lens (>=4.15 && <6), lens-aeson (>=1.2 && <2), text (>=2 && <3), vector (>=0.13 && <0.14) [details]
License BSD-3-Clause
Copyright 2019 Taisuke Hikawa
Author Taisuke Hikawa
Maintainer 23.prime.37@gmail.com
Category Math
Home page https://github.com/23prime/oeis2#readme
Bug tracker https://github.com/23prime/oeis2/issues
Source repo head: git clone https://github.com/23prime/oeis2
Uploaded by 23prime at 2024-06-11T11:25:30Z
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Downloads 2975 total (22 in the last 30 days)
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Status Docs available [build log]
Last success reported on 2024-06-11 [all 1 reports]

Readme for oeis2-1.0.8

[back to package description]

oeis2

GitHub Actions Haskell Hackage version Stackage version BSD3

Haskell interface for Online Encyclopedia of Integer Sequences; homage to oeis.

Difference from oeis

  • Source data of OEIS.
    : oeis use fmt=text, but this library use fmt=json.
  • Possible to get all search results.
  • Search functions from ID or sub-sequence are merged.
  • Possibele to search from other than ID or sub-sequence.
  • Support for HTTPS.

Usage

Add import statement.

import Math.OEIS
  • Get all search results from sub-sequence

    • If n == 0, you get all search results.

      ghci>searchSeq (SubSeq [1,2,3,4]) 0
      [OEIS {number = "A000027", ids = ["M0472","N0173"], seqData = [1,2,3,4,5,6,7,...
      ghci>length it
      53
      
    • Otherwise, you get first n search results.

      ghci>searchSeq (SubSeq [1,2,3,4]) 17
      [OEIS {number = "A000027", ids = ["M0472","N0173"], seqData = [1,2,3,4,5,6,7,8,9,
      ghci>length it
      17
      
  • Get first few terms from sub-sequence

    ghci>getSeqData (SubSeq [1,2,2,3,3,3,4,4,4,4])
    Just [1,2,2,3,3,3,4,4,4,4,5,5,5,5,5,6,6,6,6,6,6,7,7,7,7,7,7,7,...
    
  • Get Mathematica function from sub-sequence

    ghci>mathematica <$> lookupSeq (SubSeq [1,2,2,3,3,3,4,4,4,4])
    Just ["a[1] = 1; a[n_] := a[n] = a[n - a[n - 1]] + 1 (* _Branko Curgus_, May 12 2009 *)","Table[n, {n, 13}, {n}] // Flatten (* _Robert G. Wilson v_, May 11 2010 *)"]
    
  • If no search result

    ghci>lookupSeq (ID "1145141919893")
    Nothing