Base 17 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 131: | \[{17^{131}-1\over16}\] | 263 × 36705654247235339641455193236755070373260224062626643758058951204255793967401304642571232969455436113641049586841689181084276511163513402458984276636720387829<158> |