Numeric Value: 15
The folowing table expresses '15' in various number bases. 'DRx' shows the result of 'digit reducing' resulting in an X-digit long number.
| Base | DR4 | DR3 | DR2 | DR1 |
|---|---|---|---|---|
| 2 | 1111 | 100 | 1 | |
| 3 | 120 | 10 | 1 | |
| 4 | 33,12 | 3 | ||
| 5 | 30 | 3 | ||
| 6 | 23 | 5 | ||
| 7 | 21 | 3 | ||
| 8 | 17,10 | 1 | ||
| 9 | 16 | 7 | ||
| 10 | 15 | 6 | ||
| 11 | 14 | 5 | ||
| 12 | 13 | 4 | ||
| 13 | 12 | 3 | ||
| 14 | 11 | 2 | ||
| 15 | 10 | 1 | ||
| 16 | F |
Math World
Factors: 3 * 5
15 is in the Pythagorean Triples: (8, 15, 17), (15, 112, 113).
15 is the sum of the counting numbers from 1 to 5 (See 'The Sum/Product of the First N Counting Numbers').
A 'Pentadecagon' is a 'regular polygon' with 15 sides.
Physical World
15 is the atomic weight of Phosphorus (P).
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