Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 180: | \[{20^{180}-1\over19}\] | 33 × 7 × 11 × 13 × 31 × 37 × 41 × 61 × 127 × 181 × 251 × 307 × 401 × 421 × 541 × 1621 × 1801 × 2801 × 3001 × 7561 × 12277 × 24877 × 53101 × 54541 × 69481 × 71161 × 152381 × 222361 × 261451 × 55191001 × 64008001 × 167283841 × 4450002049<10> × 26876632021<11> × 79083953101<11> × 3994611390415801<16> × 1938171611440030321<19> × 1648686329813620234549081<25> × 12537438359022932459080555998361<32> |