Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 253: | \[{18^{253}-1\over17}\] | 232 × 47 × 199 × 599 × 16127 × 51217 × 6085663 × 7468009 × 224559623303159<15> × 20801237997245359<17> × 43427030398520936451647717315328803063417864449088538098259763052660664716914264117710691836192917308856078080371517846163445559400137016001593870054119047936591252177100907629207176018392498527317857797784124759002506101530780492985276071057242883820289<254> |