The folowing table expresses '561' 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 | 1000110001 | 100 | 1 | |||||||
3 | 202210 | 21,10 | 1 | |||||||
4 | 20301 | 12 | 3 | |||||||
5 | 4221 | 14,10 | 1 | |||||||
6 | 2333 | 15,10 | 1 | |||||||
7 | 1431 | 12 | 3 | |||||||
8 | 1061 | 10 | 1 | |||||||
9 | 683 | 18,10 | 1 | |||||||
10 | 561 | 12 | 3 | |||||||
11 | 470 | 10 | 1 | |||||||
12 | 3A9 | 1A | B | |||||||
13 | 342 | 9 | ||||||||
14 | 2C1 | 11 | 2 | |||||||
15 | 276 | 10 | 1 | |||||||
16 | 231 | 6 |
Factors: 3 * 11 * 17
561 is in the Pythagorean Triples: (400, 561, 689), (561, 1240, 1361).
561 is the sum of the counting numbers from 1 to 33 (See 'The Sum/Product of the First N Counting Numbers').