Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 207: | \[{18^{207}-1\over17}\] | 73 × 47 × 599 × 991 × 4831 × 21529 × 21943 × 34327 × 7468009 × 131637097 × 29214301092553<14> × 20801237997245359<17> × 237412496364593810296681<24> × 81666738358295147130408618438958417881229024866001<50> × 3335831283765997129468848570484932171598514072932729<52> × 140946324861872125757848531150859837409138117700687286630854927<63> |