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

[ bsd3, library, math ] [ Propose Tags ]

Release notes are here https://github.com/23prime/oeis2/releases


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Versions [faq] 0.1.0, 1.0.0, 1.0.1, 1.0.2
Dependencies aeson (>=1.1 && <1.5), base (>=4.7 && <5), containers (>=0.5 && <0.7), http-conduit (>=2.2 && <2.4), lens (>=4.15 && <4.18), lens-aeson (==1.0.*), text (==1.2.*), vector (==0.12.*) [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 Fri Mar 1 00:24:26 UTC 2019
Distributions LTSHaskell:1.0.2, NixOS:1.0.2, Stackage:1.0.2
Downloads 429 total (53 in the last 30 days)
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Status Hackage Matrix CI
Docs available [build log]
Last success reported on 2019-03-01 [all 1 reports]

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Readme for oeis2-1.0.2

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oeis2

Build Status

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