Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 671: | \[{4^{671}-1\over3}\] | 23 × 89 × 683 × 4027 × 48313 × 116356769 × 150238243 × 33491655209<11> × 64110547427930873<17> × 768614336404564651<18> × 2305843009213693951<19> × 10315721541618320716857581255209347260612822368454161<53> × 13646560594525825890627182668772241639702837721889959372317451952089<68> × 608833519146176962786346063898868909094632504100539398786357475514441579020823<78> × 20632455135390713070107815828033438950412109451241048848922126664412209618143869415361510662567316268200068531387<113> |