Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 155: | \[{5^{155}-1\over4}\] | 11 × 71 × 311 × 1861 × 11161 × 257611 × 5624951 × 31473312961<11> × 625552508473588471<18> × 21783999170235219053011<23> × 174583335852767865379025002452121<33> |