Base 17 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
77: | \[{17^{77}-1\over16}\] | 25646167 × 2141993519227<13> × 63183887777606431620036734659574373415341987361849452469359581232953058529<74> |