Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 138: | \[{20^{138}-1\over19}\] | 32 × 7 × 47 × 127 × 139 × 421 × 461 × 691 × 967 × 1381 × 563041 × 197317369 × 119553964489<12> × 113317059163579<15> × 3274400525856244223<19> × 46266279097921483078651<23> × 887612944642122132741202450909<30> × 9679725346609474446515209660088368664307937627<46> |