Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
196: | \[{5^{196}-1\over4}\] | 22 × 3 × 13 × 29 × 197 × 449 × 19531 × 49105547 × 234750601 × 1866013003 × 2481357870461<13> × 164204573839769<15> × 74535675530760254357<20> × 21441970593484574539001<23> × 227376585863531112677002031251<30> |