1653 | 3 551 | 19 29 | 29 1 |
1653 = 3 × 19 × 29
210 | 2 105 | 3 35 | 5 7 | 7 1 |
210 = 2 × 3 × 5 × 7
390 | 2 195 | 3 65 | 5 13 | 13 1 |
390 = 2 × 3 × 5 × 13
375 | 3 125 | 5 25 | 5 5 | 5 1 |
375 = 3 × 5 × 5 × 5 = 3 × 53