Base 27 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 63: | \[{27^{63}-1\over26}\] | 109 × 433 × 757 × 1093 × 8209 × 368089 × 144542918285300809<18> × 49888641454623789553<20> × 67775349707440873247475442867753<32> |