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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
Dependencies aeson (>=1.1 && <1.6), base (>=4.7 && <5), containers (>=0.5 && <0.7), http-conduit (>=2.2 && <2.4), lens (>=4.15 && <5), lens-aeson (>=1.0 && <1.2), text (>=1.2 && <1.3), vector (>=0.12 && <0.13) [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 2020-06-10T12:31:08Z
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Downloads 2934 total (21 in the last 30 days)
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Status Docs available [build log]
Last success reported on 2020-06-10 [all 1 reports]

Readme for oeis2-1.0.4

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oeis2

Travis Build Status 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