Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 280: | \[{3^{280}-1\over2}\] | 24 × 52 × 112 × 29 × 41 × 61 × 71 × 281 × 547 × 1093 × 1181 × 16493 × 18481 × 430697 × 647753 × 28596961 × 32839661 × 42521761 × 94373861 × 2664097031 × 374857981681<12> × 369879560116990841<18> × 3353336738929580410561<22> |