Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 192: | \[{4^{192}-1\over3}\] | 3 × 5 × 7 × 13 × 17 × 97 × 193 × 241 × 257 × 641 × 673 × 769 × 65537 × 274177 × 6700417 × 22253377 × 67280421310721<14> × 18446744069414584321<20> × 442499826945303593556473164314770689<36> |