len(WeylGroup(["B", 6]).as_permutation_group().conjugacy_classes_subgroups())

[Martin R]

gives me 7441, 7442 or even 7443.

I am baffled.

Martin

[Dima Pasechnik]

On Thu, Sep 25, 2025 at 4:51 PM 'Martin R' via sage-devel
<sage-...@googlegroups.com> wrote:
>
> gives me 7441, 7442 or even 7443.

I tried this directly with GAP, and got 7442.
Is this the correct number?

Dima


>
> I am baffled.
>
> Martin
>
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[Nils Bruin]

When I tried with sage, I got 7440, which agrees with what magma computes. So I think this strongly points to a problem in gap (given it's not even self-consistent)

[David Roe]

7440 is what we have in the LMFDB, though that's redundant with the information that Nils provided, since it was computed with Magma.

David

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[Dima Pasechnik]

with just released GAP 4.15.beta3, I am getting 7440.
(tried twice, same answer)
With 4.14, it's most probably the bug reported in
https://github.com/gap-system/gap/issues/5981
and then fixed

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[Martin R]

cool, thank you!