Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 197: | \[{18^{197}-1\over17}\] | 3768811729 × 2961269699543<13> × 207926667436844593278514132440420212226340576488354082641104090785099422917327<78> × 492767419171393512361782431563894303038785537460170557457758623888162241625769978282534261809248860227154561550874008150967611932314127653793916279<147> |