Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 447: | \[{4^{447}-1\over3}\] | 3 × 7 × 1193 × 650833 × 38369587 × 19687929049<11> × 86656268566282183151<20> × 8235109336690846723986161<25> × 7984559573504259856359124657<28> × 8622186599991634321861907987522778823799744005651006554580680854177065460635939<79> × 72751284869088788795301631728906362894695299875729701287430721838248329952225963533888951<89> |