Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 352: | \[{4^{352}-1\over3}\] | 5 × 17 × 23 × 89 × 257 × 353 × 397 × 641 × 683 × 1409 × 2113 × 65537 × 229153 × 1258753 × 5304641 × 6700417 × 119782433 × 2931542417 × 43872038849<11> × 441995541378330835457<21> × 275509565477848842604777623828011666349761<42> × 2724766004649595434157241343741767729156891206422918570211139111809<67> |