Base 27 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 81: | \[{27^{81}-1\over26}\] | 109 × 433 × 757 × 3889 × 8209 × 70957 × 1190701 × 6627097 × 12557612956332313<17> × 21835473162448454819220238921<29> × 19149704835029612299033896988868835457<38> |