Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 511: | \[{4^{511}-1\over3}\] | 43 × 127 × 439 × 1753 × 2298041 × 3191707 × 10435643 × 15212471 × 9361973132609<13> × 1795918038741070627<19> × 44523886942460772001<20> × 22310863847225018142861783673497419<35> × 144780974187086260903935034761413745643636578290924150417<57> × 498905117043694516642621535114344067442559066124504501336606929<63> × 2537599745025519134156761164267591913521835535529224725592538658153<67> |