Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 265: | \[{4^{265}-1\over3}\] | 11 × 31 × 107 × 6361 × 69431 × 20394401 × 29324808311<11> × 28059810762433<14> × 197748738449921<15> × 593783678966863030035641<24> × 36614110124735294634435619027766763481<38> × 1007715965875748226745472989687556259131<40> |