Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 114: | \[{21^{114}-1\over20}\] | 2 × 11 × 421 × 463 × 304609 × 609673 × 5285953 × 67505443 × 12061389013<11> × 54921106624003<14> × 987749814642143197<18> × 1168393184916024427650240126995059<34> × 1244541772187848099210936765314595053007129<43> |