Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 45: | \[{21^{45}-1\over20}\] | 5 × 211 × 463 × 9391 × 18181 × 40841 × 41489011 × 57815101 × 85775383 × 22554946693833031<17> |
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 45: | \[{21^{45}-1\over20}\] | 5 × 211 × 463 × 9391 × 18181 × 40841 × 41489011 × 57815101 × 85775383 × 22554946693833031<17> |