Base 17 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
121: | \[{17^{121}-1\over16}\] | 2141993519227<13> × 59475866345520219051333125609808893831<38> × 67134006980485085641582180502996346325654133<44> × 559883933862382656973027881983741715862351087609229881<54> |