Base 17 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
74: | \[{17^{74}-1\over16}\] | 2 × 32 × 149 × 223 × 1481 × 2591 × 172683287783<12> × 1016919604559540581<19> × 6218882581209875638403<22> × 281880352305551730895009697<27> |