Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 655: | \[{4^{655}-1\over3}\] | 11 × 31 × 263 × 1049 × 104801 × 597361 × 4744297 × 4235167121 × 2576754528566814601<19> × 351182936972570824983481<24> × 52900187100851753648745461411<29> × 182331128681207781784391813611<30> × 10350794431055162386718619237468234569<38> × 17208429584639695721394569191520766721<38> × 15333541100090824437129533485272856744656791<44> × 213732345927036277063342078342573605826938066316475164889831797001<66> × 12356361811255150342737867168302434491945676054103629365378279799384990255121<77> |