Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 387: | \[{18^{387}-1\over17}\] | 73 × 431 × 991 × 1033 × 6967 × 13159 × 34327 × 221623 × 4555249 × 8740783 × 2853740157913<13> × 1830508640697003889<19> × 4464951753212028068412713<25> × 28971751902509263440682681<26> × 18929430509608545389368331983<29> × 10403007323439753521817766790548683893041<41> × [64924581671899470842778376495164535607860129059435700590744910384566940277075097611142787294681997631752808528952579575341171254185962291563147289216690324141450814040728013801465200558565737012583161123419731887093455285624651042301339967140370766477793759029180153687938409176163878305809209<293>] |