Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 351: | \[{20^{351}-1\over19}\] | 79 × 421 × 1171 × 3121 × 142559 × 363871 × 9690539 × 64008001 × 879338701 × 405641573299<12> × 298114935351301<15> × 172311318287603732461390609<27> × 50676846610970769808122928009<29> × 118933712884146690115884402241411<33> × 256063908633871845537541706060016525021086384110684477035559<60> × [2182888877467643076888440900940798523263098479909469597057297608502223265395589013603985017171422564811211487434960685174648045547750011667815816211706688459454993669008366035098453407829264423181590033006981632011265755479659958039524009<238>] |