2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/74450Finite hamiltonian groups are counted. The sequence of numbers of all groups of order $n$ all whose subgroups are normal and the sequence of numbers of all groups of order less or equal to $n$ all whose subgroups are normal are presented.6 pages, 8 tablesCombinatoricsGroup Theory11Y55;05C25;20B05text