Răspuns:
de 2 cifre:10,15,17,19,50,51,57,59,70,71,75,79,90,91,95.97,
de 3 cifre: 105,107,109,157,159,175,179,195,197
de 2 cifre: 86,85,82,80,68,65,62,60,68,56,52,50,28,26,25,20
de 3 cifre: 865,856,820,802,586,580,568,560,520,508,506,520,508,506,502,286,285,268,265,258,256,208,206,205
Explicație pas cu pas: