Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 159: | \[{20^{159}-1\over19}\] | 421 × 51199 × 593071 × 628051 × 13217671 × 111566857524391<15> × 3756837362395129<16> × 24540050076369381718561<23> × 8330844915605563493878201<25> × 3257272076316750353139146661697870498891<40> × 1298492579223032596001212198884047994647245663190117551588080001<64> |