The folowing table expresses '205' in various number bases. 'DRx' shows the result of 'digit reducing' resulting in an X-digit long number.
| Base | DR8 | DR7 | DR6 | DR5 | DR4 | DR3 | DR2 | DR1 |
|---|---|---|---|---|---|---|---|---|
| 2 | 11001101 | 101 | 10 | 1 | ||||
| 3 | 21121 | 21,10 | 1 | |||||
| 4 | 3031 | 13,10 | 1 | |||||
| 5 | 1310 | 10 | 1 | |||||
| 6 | 541 | 14 | 5 | |||||
| 7 | 412 | 10 | 1 | |||||
| 8 | 315 | 11 | 2 | |||||
| 9 | 247 | 14 | 5 | |||||
| 10 | 205 | 7 | ||||||
| 11 | 177 | 14 | 5 | |||||
| 12 | 151 | 7 | ||||||
| 13 | 12A | 10 | 1 | |||||
| 14 | 109 | A | ||||||
| 15 | DA,18 | 9 | ||||||
| 16 | CD,19 | A |
Factors: 5 * 41
205 is in the Pythagorean Triples: (84, 187, 205), (205, 828, 853), (133, 156, 205).