Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 319: | \[{4^{319}-1\over3}\] | 23 × 59 × 89 × 233 × 683 × 1103 × 2089 × 18503 × 64439 × 3033169 × 84819793631<11> × 121333341977<12> × 169523514238420211<18> × 25925516494438382632167017<26> × 5461859373498087771053790065009<31> × 9609322039095554268277107484843200218262250152281700954275029793<64> |