A316559 Number of abelian subgroups of the group GL(2, Z(n)), counting conjugates as distinct.

1, 5, 34, 147, 251, 309, 890, 10683, 2440, 2487, 3088

Offset: 1

Author

Andrew Howroyd, Jul 06 2018

Keywords

• nonn
• more

Crossrefs

Cf. A316536, A316560.

Programs

GAP

Concatenation([1], List([2..7], n->Sum( Filtered( ConjugacyClassesSubgroups( GL(2, Integers mod n)), x->IsAbelian( Representative(x))), Size)));