Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 107: | \[{5^{107}-1\over4}\] | 6421 × 5486016363791<13> × 35411885288978941<17> × 172163150940018661<18> × 717433171088016374418821<24> |