Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 291: | \[{20^{291}-1\over19}\] | 421 × 53678965801<11> × 4897732241509<13> × 3458308355911001<16> × 1551278457001703299460425309<28> × 375921460689078723273556870099<30> × 49613947804350394354357836874439<32> × 24087249964807710583843491880243798561<38> × [784968560917375684995516362954323362826556390103882161740558712549563693927649415233679881464012063322909985226051113887340957939440707965242346369036980500395966476490540739446951650925327697023944139854000701<210>] |