Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 222: | \[{18^{222}-1\over17}\] | 73 × 19 × 223 × 307 × 1259 × 56167 × 157991 × 239539 × 6613356544591<13> × 2756670060171673<16> × 57095169829153516132919139336069139<35> × 10375318069755905859690041706382489471961<41> × 1164939463722239475169554761379636729267089<43> × 184948750196762913018999312696186016313903918813731<51> × 9914674020585919507893529088584073241878059013967173977<55> |