Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 222: | \[{4^{222}-1\over3}\] | 3 × 5 × 7 × 13 × 149 × 223 × 593 × 1777 × 3109 × 3331 × 17539 × 321679 × 25781083 × 26295457 × 184481113 × 231769777 × 319020217 × 616318177 × 1398316729 × 4345052821<10> × 107775231312019<15> × 1453030298001690873541<22> |