Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 455: | \[{20^{455}-1\over19}\] | 11 × 29 × 61 × 71 × 131 × 251 × 491 × 521 × 701 × 911 × 3121 × 3511 × 4421 × 23311 × 32719 × 90481 × 142559 × 164011 × 282101 × 9690539 × 4470064171<10> × 13295107990361<14> × 144142570154831<15> × 4329520082233745656921<22> × 68769235505754630360746461749721111<35> × 104933918101562798067516186656513621<36> × 42753079684768103157355121804168940801106384712792554767161<59> × 4261988945381057264021546494778142174683314573168556469860542063724971<70> × 169236805028411973979130037985135497592049135209225133763543471663294699899771<78> × [37411838515021859608035803707084813796266646428336262420632262729149390582294916782643948964469529712225254216051272356388148337264291626812269479167897030379526500659029804597347253680671<188>] |