Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 428: | \[{5^{428}-1\over4}\] | 22 × 3 × 13 × 643 × 6421 × 25253 × 5486016363791<13> × 35411885288978941<17> × 172163150940018661<18> × 23252612956243152283169<23> × 717433171088016374418821<24> × 18394448899336309965200241530917<32> × 997778184811820085932891049469009<33> × 1355507900603939940964116623682001125857705117367958794481<58> × 159745355677531226795726527119537776550594226912629399294136965936054647<72> |