Explicație pas cu pas:
[tex]307 = 307^{1} [/tex]
[tex]905 = 5 ^{1} \times 181^{1} [/tex]
[tex]420 = {2}^{2} \times {3}^{1} \times {5}^{1} \times {7}^{1} [/tex]
[tex]660 = {2}^{2} \times {3}^{1} \times {5}^{1} \times {11}^{1} [/tex]
[tex]405 = {3}^{4} \times {5}^{1} [/tex]
[tex]370 = {2}^{1} \times {5}^{1} \times {37}^{1}[/tex]
