Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 47: | \[{20^{47}-1\over19}\] | 1129 × 4889 × 790551835729<12> × 1930941642781<13> × 87910897915022054334374219609<29> |
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 47: | \[{20^{47}-1\over19}\] | 1129 × 4889 × 790551835729<12> × 1930941642781<13> × 87910897915022054334374219609<29> |