Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 359: | \[{21^{359}-1\over20}\] | 719 × 81853 × 20646091 × 2285885831 × 458142421507<12> × 1913330302533913<16> × 12682798056668841659<20> × [7691931624745510681066458936897199157686795077243129885702673245240090877133521213336207099744927020039243898688550701917415217096794946484999170718582483951455879092881395019746297084830197852133735728407031137786029606863055273714061469596105028670467060817742341771029870018823507657826686466462307308399559542644354511017561280345680930188695203429064938990371916499800321313751559472007528896864053<403>] |