Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 553: | \[{3^{553}-1\over2}\] | 1093 × 317093519 × 432853009 × 392038110671<12> × 145171177264407947<18> × 240780364415138273081833<24> × 87342335082383885287816699213<29> × 1496011698256808140870327017215159254210989805180702509984299821<64> × 1311856567988975419611247459617464197060581406673461639594334403781089672393080946888216894062632439<100> |