cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A086643 Number of zeros in the character table of the group GL(2,Z_n).

Original entry on oeis.org

0, 1, 15, 54, 172, 184, 819
Offset: 1

Views

Author

Yuval Dekel (dekelyuval(AT)hotmail.com), Jul 26 2003

Keywords

Crossrefs

Cf. A000252.

A364921 Number of conjugacy classes of subgroups of the group GL(2, Z_n) of invertible 2 X 2 matrices mod n.

Original entry on oeis.org

1, 4, 16, 62, 48, 109, 84, 2265, 324, 345, 114, 5359, 217, 636, 2540, 27908, 218, 2872, 272, 20933, 4089, 756, 169, 780487, 892, 1813, 3015, 30562, 349, 31419, 510, 191856, 5096, 1743, 14139, 115902, 685, 2156, 13191, 3764246, 662, 51063, 600, 38346, 56222, 1130, 271
Offset: 1

Views

Author

Robin Visser, Aug 12 2023

Keywords

Crossrefs

Cf. A000252, A066514.

Programs

  • Magma
    [#Subgroups(GL(2, ResidueClassRing(n))) : n in [2..50]];
  • Sage
    [len(GL(2, Zmod(n)).as_permutation_group().conjugacy_classes_subgroups()) for n in range(2, 50)]
Previous Showing 31-32 of 32 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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