#14247: bell numbers in mpmath is incorrect
-----------------------------+----------------------------------------------
Reporter: tscrim | Owner: sage-combinat
Type: defect | Status: new
Priority: major | Milestone: sage-5.9
Component: combinatorics | Keywords:
Work issues: | Report Upstream: N/A
Reviewers: | Authors:
Merged in: | Dependencies: #10170
Stopgaps: |
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With #10170, for at least `n >= 30`, mpmath's `bell(n)` is incorrect:
{{{
sage: bell_number(30, 'mpmath')
846749014511809388871680
sage: bell_number(30, 'gap')
846749014511809332450147
}}}
The GAP implementation is the correct one (it agrees with OEIS and the
implementation in #10170 for `n > 200`). I don't know if this is a me
(i.e. this is fixed in an upgrade of mpmath not yet merged as of
`5.8.beta1`), sage, or an mpmath issue.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14247>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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