Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 293: | \[{5^{293}-1\over4}\] | 1759 × 520369 × 224108738217451<15> × 88957588316686547560127731<26> × 86085941260484007160111338231150740696700430312683094584213613181283345372986143196903911684962291372442152047648269091385526900596218615270866093785234931<155> |