Number Info
| ID | 6 |
| Size | 2 digits / 5 bits |
| Value | 21 |
| Progress | 100.00% |
| Completed | yes |
| Small factors | 3 × 7 |
| Cofactor | none |
Factorization
Format: number = small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
21 = 3 × 7
Categories
- Fibonacci Sequence (index 8)
- Base 4 Repunits (index 3)
- Base 20 Repunits (index 2)