Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 394: | \[{4^{394}-1\over3}\] | 5 × 4729 × 7487 × 52009 × 1079423677 × 152874915601<12> × 197002597249<12> × 1348959352853811313<19> × 251951573867253012259144010843<30> × 51480369709170501304394118553664009<35> × 3862163385805798697201354795194661512726441364448411929<55> × 26828803997912886929710867041891989490486893845712448833<56> |