Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 129: | \[{18^{129}-1\over17}\] | 73 × 431 × 1033 × 6967 × 221623 × 4555249 × 1830508640697003889<19> × 4464951753212028068412713<25> × 28971751902509263440682681<26> × 18929430509608545389368331983<29> × 10403007323439753521817766790548683893041<41> |