Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 41: | \[{21^{41}-1\over20}\] | 83 × 14122861 × 83218931 × 17222085343<11> × 914531249431<12> × 52899783148909<14> |
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 41: | \[{21^{41}-1\over20}\] | 83 × 14122861 × 83218931 × 17222085343<11> × 914531249431<12> × 52899783148909<14> |