x:9=c si rest r unde c=3r
x=9c+r=9×3r+r=28r
r={1,2,3,4,5,6,7,8}
numerele sunt
x={28,56,84,112,140,168,196,224}
verificare
28:9=3 si rest 1 (adica c=3r)
56:9=6 si rest 2
84:9=9 si rest 3
112:9=12 si rest 4
140:9=15 si rest 5
168:9=18 si rest 6
196:9=21 si rest 7
224:9=24 si rest 8
