Base 16 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 57: | \[{16^{57}-1\over15}\] | 3 × 7 × 13 × 229 × 457 × 571 × 32377 × 131101 × 160969 × 174763 × 524287 × 525313 × 1212847 × 160465489 × 275415303169<12> |