OFFSET
1,2
PROG
(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)]
CROSSREFS
KEYWORD
nonn
AUTHOR
Robin Visser, Aug 12 2023
STATUS
approved