Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 225: | \[{20^{225}-1\over19}\] | 11 × 31 × 61 × 151 × 251 × 421 × 1451 × 3001 × 11251 × 53101 × 261451 × 865801 × 964351 × 1369801 × 1616851 × 7466201 × 46794901 × 64008001 × 79083953101<11> × 3994611390415801<16> × 1678948642735766551<19> × 9308203137060768572251<22> × 104988737576990732806404001<27> × 295586564842028790149017501<27> × 2683240218166206899874382651<28> × 739425808580294513071002073588069248322378854015883140248198811301<66> |