Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 214: | \[{21^{214}-1\over20}\] | 2 × 11 × 2141 × 1734899 × 4272624310883<13> × 16039770717611<14> × 352523466309500183<18> × 28393434685140971659<20> × 17813258783089772599327<23> × 55837009494804076861723<23> × 16339864316070753885738065827<29> × 62966131031683950925080167776709767184533584081571817<53> × 7857162298013234995174888220370914647816448117188053641633168786248647653953228927<82> |