Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 116: | \[{4^{116}-1\over3}\] | 5 × 17 × 59 × 233 × 1103 × 2089 × 59393 × 3033169 × 107367629 × 536903681 × 82280195167144119832390568177<29> |