Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 255: | 3 × 7 × 11 × 31 × 103 × 151 × 307 × 331 × 2143 × 2857 × 6529 × 11119 × 12241 × 43691 × 106591 × 131071 × 949111 × 418562986357561<15> × 9520972806333758431<19> × 26831423036065352611<20> × 51366149455494753931<20> × 5702451577639775545838643151<28> |