Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 97: | \[{20^{97}-1\over19}\] | 53678965801<11> × 3458308355911001<16> × 375921460689078723273556870099<30> × 49613947804350394354357836874439<32> × 24087249964807710583843491880243798561<38> |