Question

D28,D40,D50,D56,D61,D72

Answer 1

D28=1,2,4,7,14.28
D40=1,2,4,5,8,10,20,40
D50=1,2,5,10,25,50
D56=1,2,4,7,8,14,28,56
D61=1,61(numarul este prim)
D72=1.2.3.4.6,8,9,12,16,24,36,72

Answer 2

D28 apartine{ 1,2,4,7,14,28}
D40 apartine { 1,2,4,5,8,10,20,40}
D 50 apartine { 1,2,5,10,25,50}
D56 apartine { 1,2,4,7,8,14,28}
D 61 apartine { 1,61}
D 72 apartine { 1,2,3,4,6,8,9,12,18,24,36,72}