Base 16 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 131: | \[{16^{131}-1\over15}\] | 263 × 1049 × 4744297 × 269665073 × 642811237 × 2745098189 × 810791440841<12> × 12450751815271172041<20> × 308544695409769427309<21> × 182331128681207781784391813611<30> × 10350794431055162386718619237468234569<38> |