Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 258: | \[{3^{258}-1\over2}\] | 22 × 7 × 13 × 431 × 1549 × 4129 × 27091 × 1651439941 × 2199072289 × 28395735937<11> × 7822354593043<13> × 380808546861411923<18> × 82064241848634269407<20> × 912851565662857110894244969<27> |