Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 202: | \[{21^{202}-1\over20}\] | 2 × 11 × 9091 × 376529 × 2782147 × 5766091 × 322064357 × 2991025189177537<16> × 9169578247930711724838223927<28> × 36945809153030964318516966609973698395187560924157000812220580201578519173448190367<83> × 155416071927404779953668313576558799794977582720051874285460165783082976467503409718287370683427713074427507<108> |