oeis2's Introduction

oeis2

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

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oeis2's Issues

test suite failure

oes2-1.0.6 failed in a recent Stackage test run with the following error message:

      test/Spec.hs:29:5:
      1) Test for lookupSeq Compare lookup by ID with by SubSeq

[ generated example elided ]

      To rerun use: --match "/Test for lookupSeq/Compare lookup by ID with by SubSeq/"

    Randomized with seed 1521710722

    Finished in 1.4243 seconds
    4 examples, 1 failure

oeis2-1.0.7 fails to build with aeson-2

src/Math/OEIS/Internal.hs:124:27: error:
    • Couldn't match expected type ‘Key’ with actual type ‘T.Text’
    • In the first argument of ‘key’, namely ‘k’
      In the first argument of ‘(.)’, namely ‘key k’
      In the second argument of ‘(^?)’, namely ‘key k . _Integer’
    |
124 |   = let d = result ^? key k ._Integer
    |                           ^

src/Math/OEIS/Internal.hs:136:27: error:
    • Couldn't match expected type ‘Key’ with actual type ‘T.Text’
    • In the first argument of ‘key’, namely ‘k’
      In the first argument of ‘(.)’, namely ‘key k’
      In the second argument of ‘(^?)’, namely ‘key k . _String’
    |
136 |   = let d = result ^? key k ._String
    |                           ^

src/Math/OEIS/Internal.hs:150:29: error:
    • Couldn't match expected type ‘Key’ with actual type ‘T.Text’
    • In the first argument of ‘key’, namely ‘k’
      In the first argument of ‘(.)’, namely ‘key k’
      In the second argument of ‘(^?)’, namely ‘key k . _Array’
    |
150 |   = let ds  = result ^? key k . _Array
    |                             ^

src/Math/OEIS/Internal.hs:154:41: error:
    • Couldn't match expected type ‘Key’ with actual type ‘T.Text’
    • In the first argument of ‘key’, namely ‘k’
      In the first argument of ‘(.)’, namely ‘key k’
      In the second argument of ‘(^?!)’, namely ‘key k . nth i . _String’
    |
154 |         let ts  = (\i -> result ^?! key k . nth i . _String) <$> [0..(len - 1)]
    |                                         ^

As a Hackage trustee I have revised v1.0.7: https://hackage.haskell.org/package/oeis2-1.0.7/revisions/

EDIT: Related: commercialhaskell/stackage#6498

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