Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
255: | \[{3^{255}-1\over2}\] | 112 × 13 × 1871 × 4561 × 12853 × 34511 × 99810171997<11> × 2663568851051<13> × 862970652262943171<18> × 16960184261245211770124551477792778196298722974881637673135361<62> |