Răspuns :
Nr sunt de forma SZU unde:
U=4 ⇒ S=2*4=8
Z∈{0,1,2,3,4,5,6,7,8,9,}
Nr sunt: 804,814,824,834,8444,854,864,974,884,894
U=4 ⇒ S=2*4=8
Z∈{0,1,2,3,4,5,6,7,8,9,}
Nr sunt: 804,814,824,834,8444,854,864,974,884,894