Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 219: | \[{5^{219}-1\over4}\] | 31 × 439 × 429241 × 2183431 × 4853479 × 5729041 × 239701757320911389817996792709<30> × 9519524151770349914726200576714027279<37> × 366676038760615062548074285016706043440761337360791812501<57> |