Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 147: | \[{18^{147}-1\over17}\] | 75 × 449 × 80207 × 101921 × 19148809 × 32401295018849<14> × 156107192084257<15> × 15944803462923633762605952120076033<35> × 20684766401518363796396833811720566410775404979640152761413256241131578671440317871550774360898623<98> |