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.

Showing 1-3 of 3 results.

A062250 Number of cyclic subgroups of Chevalley group A_n(2) (the group of nonsingular n X n matrices over GF(2) ).

Original entry on oeis.org

1, 5, 79, 6974, 2037136, 2890467344, 14011554132032, 325330342132674560, 27173394819858612320256, 10158190320726534408118452224, 13156630408268153048253765001412608, 80280189722884518774834501142737770774528
Offset: 1

Views

Author

Ahmed Fares (ahmedfares(AT)my-deja.com), Jul 01 2001

Keywords

Examples

			a(3) = 1/phi(1)+21/phi(2)+56/phi(3)+42/phi(4)+48/phi(7) = 79.
		

References

  • V. Jovovic, The cycle index polynomials of some classical groups, Belgrade, 1995, unpublished.

Crossrefs

Formula

a(n) = Sum_{d} |{g element of A_n(2): order(g)=d}|/phi(d), where phi=Euler totient function, cf. A000010.

Extensions

More terms from Vladeta Jovovic, Jul 04 2001

A037447 Number of conjugacy classes of subgroups of the Chevalley group A_n(2) (the group of nonsingular n X n matrices over GF(2)).

Original entry on oeis.org

1, 4, 15, 137, 1411, 88044
Offset: 1

Views

Author

Ahmed Fares (ahmedfares(AT)my-deja.com), Jun 30 2001

Keywords

Crossrefs

Programs

  • Magma
    [#Subgroups(GL(n,2)) : n in [1..6]];  // Robin Visser, Aug 14 2023

Extensions

a(5)-a(6) from Robin Visser, Aug 14 2023

A047052 Number of Abelian subgroups of Chevalley group A_n(2) (the group of nonsingular n X n matrices over GF(2)).

Original entry on oeis.org

1, 5, 93, 11449, 4709398, 23380019770
Offset: 1

Views

Author

Ahmed Fares (ahmedfares(AT)my-deja.com), Jul 18 2001

Keywords

Crossrefs

Programs

  • Magma
    [&+[s`length : s in AbelianSubgroups(GL(n,2))] : n in [1..6]];  // Robin Visser, Aug 14 2023

Extensions

a(5)-a(6) from Robin Visser, Aug 14 2023
Showing 1-3 of 3 results.