Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 431: | \[{5^{431}-1\over4}\] | 3449 × 494789 × 598229 × 47689015695989309431<20> × 54522025208291218710651557321317098653605566672606370300576836547393316681<74> × 208685769010368314572259986263286828744573415657026851409263049818112651939<75> × 8138568308775354269665055583951464802754641104872389447982826896972038393647971171448083449995020177528912356200814031<118> |