Răspuns:
1728:2=864
864:2=432
432:2=216
216:2=108
108:2=54
54:2=27
27:3=9
9:3=3
3:3=1
1728=2^6x3^3 nu e pătrat perfect
2519:11=229
1+55=56
3+53=56
5+51=56
7+49=56
9+47=56
11+45=56
13+43=56
15+41=56
17+39=56
19+37=56
21+35=56
23+33=56
12x56=672
672=2^5x3x7 nu e pătrat perfect
