Base 27 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
53: | \[{27^{53}-1\over26}\] | 107 × 24169 × 712550912937217<15> × 3747607031112307667<19> × 40559607827224525043263763418498193<35> |