Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 273: | \[{4^{273}-1\over3}\] | 3 × 72 × 43 × 79 × 127 × 337 × 547 × 911 × 2731 × 5419 × 8191 × 121369 × 224771 × 1210483 × 22366891 × 108749551 × 112901153 × 23140471537<11> × 25829691707<11> × 105310750819<12> × 4093204977277417<16> × 86977595801949844993<20> × 292653113147157205779127526827<30> |