Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 437: | \[{4^{437}-1\over3}\] | 47 × 7867 × 174763 × 178481 × 524287 × 2796203 × 3198841 × 5579617 × 6203145044672921<16> × 668214452631436913<18> × 315929758125865060721<21> × 1905976815426273605733466333451<31> × 76477819765444619368130651164956718316971995659<47> × 728853407707467208421993458966504139019157860437186335406130262344738292438484569798131887<90> |