Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 196: | \[{20^{196}-1\over19}\] | 3 × 73 × 29 × 71 × 197 × 401 × 827 × 3529 × 5881 × 10529 × 14561 × 32719 × 269737651 × 1424354653 × 2488859795549<13> × 158801586229862983170858567089<30> × 6551154092925933298930251891324599<34> × 628292358238289452269193508271835428805485714102857143<54> × 5868970976675994117193657065956205629904710379447645616883364917958700241<73> |