Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 351: | \[{21^{351}-1\over20}\] | 79 × 109 × 163 × 463 × 547 × 1171 × 189437 × 1845559 × 4779433 × 61045219 × 85775383 × 198303067 × 516094151 × 2705936221 × 7429452749713<13> × 296578693067203<15> × 1728036729500833441<19> × 182900753192289233804509<24> × 80459337199345300130638393<26> × 479667952955520596219571126379<30> × 5409410795213092497224719423678323088390021822753211482321<58> × 42823714165950184296640870847353794295347195551826391352550230474130225994164815283859394859238743999369813043483457709856655734812989147576662964037379032681954926590901460421216893637991762803348477793071<206> |