Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 35: | \[{21^{35}-1\over20}\] | 5 × 43 × 631 × 1471 × 3319 × 40841 × 4149601 × 20028751 × 421503321597121<15> |
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 35: | \[{21^{35}-1\over20}\] | 5 × 43 × 631 × 1471 × 3319 × 40841 × 4149601 × 20028751 × 421503321597121<15> |