Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
143: | \[{20^{143}-1\over19}\] | 3121 × 142559 × 461891 × 9690539 × 1037966360861<13> × 10778947368421<14> × 89069400431539529<17> × 821651084995160038985081<24> × 35990206967222156371667587832089524304326308981058127290969578110524231074711982724530429617137819<98> |