Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
48: | \[{18^{48}-1\over17}\] | 52 × 73 × 13 × 19 × 97 × 113 × 229 × 307 × 457 × 929 × 1153 × 2474209 × 113607841 × 11019855601<11> × 42569092513<11> |