The folowing table expresses '721' in various number bases. 'DRx' shows the result of 'digit reducing' resulting in an X-digit long number.
| Base | DR10 | DR9 | DR8 | DR7 | DR6 | DR5 | DR4 | DR3 | DR2 | DR1 |
|---|---|---|---|---|---|---|---|---|---|---|
| 2 | 1011010001 | 101 | 10 | 1 | ||||||
| 3 | 222201 | 100 | 1 | |||||||
| 4 | 23101 | 13,10 | 1 | |||||||
| 5 | 10341 | 14,10 | 1 | |||||||
| 6 | 3201 | 10 | 1 | |||||||
| 7 | 2050 | 10 | 1 | |||||||
| 8 | 1321 | 7 | ||||||||
| 9 | 881 | 18,10 | 1 | |||||||
| 10 | 721 | 10 | 1 | |||||||
| 11 | 5A6 | 1A,10 | 1 | |||||||
| 12 | 501 | 6 | ||||||||
| 13 | 436 | 10 | 1 | |||||||
| 14 | 397 | 15 | 6 | |||||||
| 15 | 331 | 7 | ||||||||
| 16 | 2D1 | 10 | 1 |
Factors: 7 * 103