Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 189: | \[{18^{189}-1\over17}\] | 74 × 127 × 449 × 631 × 991 × 2143 × 16633 × 23761 × 34327 × 80207 × 253369 × 1292257 × 1464049 × 4464073 × 147782881 × 430244137 × 10346280217687<14> × 156107192084257<15> × 43237127713829239<17> × 75072892952027455633<20> × 6974796889885559915764172408527<31> × 104471216044501450890653209631992206413870976781985176404326041921<66> |