Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
262: | \[{3^{262}-1\over2}\] | 22 × 263 × 787 × 114742271896804438572098194909<30> × 881304930739946561320646289889<30> × 605199588591144003100881306574406851660288427740394885828171<60> |