Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 83: | \[{31^{83}-1\over30}\] | 167 × 499 × 182933 × 40003511 × 74824336159<11> × 51593443404264110239768071673<29> × 85912184821599706072006943100214874792000179599875431278393402841<65> |