Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 41: | \[{20^{41}-1\over19}\] | 739 × 788985829969499330639<21> × 19850094536448035972954342201<29> |
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 41: | \[{20^{41}-1\over19}\] | 739 × 788985829969499330639<21> × 19850094536448035972954342201<29> |