Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 125: | \[{4^{125}-1\over3}\] | 11 × 31 × 251 × 601 × 1801 × 4051 × 229668251 × 269089806001<12> × 4710883168879506001<19> × 5519485418336288303251<22> |