Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 234: | \[{21^{234}-1\over20}\] | 2 × 11 × 19 × 37 × 79 × 199 × 421 × 463 × 547 × 613 × 1171 × 11701 × 29251 × 189437 × 629773 × 61045219 × 85775383 × 516094151 × 7021471715414521<16> × 13473153762727699<17> × 7691526674487958994017<22> × 80459337199345300130638393<26> × 479667952955520596219571126379<30> × 5409410795213092497224719423678323088390021822753211482321<58> × 402000070502466363303394158688770301691028322229205830765453939962995057529<75> |