Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
179: | \[{21^{179}-1\over20}\] | 6803 × 12889 × 2027713 × 28739902275014980163546625880652015331955019287832976374361568207195638266664469886412815364734295860251332877<110> × 4653849070153408649951413909561827334268434279713859073327066819640634253479106720789945017525332426399319640897<112> |