Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 425: | \[{4^{425}-1\over3}\] | 11 × 31 × 251 × 601 × 1801 × 4051 × 43691 × 131071 × 91362251 × 5046718903451<13> × 9520972806333758431<19> × 26831423036065352611<20> × 4777345536534924905725989065906794483551790056167373849557595739795782900601<76> × 2069237502716464794985816105550982396339012259800336045348830659287429006970383760001800897298401<97> |