The folowing table expresses '210' 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 | 11010010 | 100 | 1 | |||||
3 | 21210 | 20 | 2 | |||||
4 | 3102 | 12 | 3 | |||||
5 | 1320 | 11 | 2 | |||||
6 | 550 | 14 | 5 | |||||
7 | 420 | 6 | ||||||
8 | 322 | 7 | ||||||
9 | 253 | 11 | 2 | |||||
10 | 210 | 3 | ||||||
11 | 181 | A | ||||||
12 | 156 | 10 | 1 | |||||
13 | 132 | 6 | ||||||
14 | 110 | 2 | ||||||
15 | E0 | E | ||||||
16 | D2 | F |
Factors: 2 * 3 * 5 * 7
210 is the sum of the counting numbers from 1 to 20 (See 'The Sum/Product of the First N Counting Numbers').