Base 13 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 106: | \[{13^{106}-1\over12}\] | 2 × 7 × 107 × 3499 × 194723 × 7504072417<10> × 202326783229<12> × 189541180943969<15> × 8403659652641423<16> × 37379721025854083<17> × 39349502420618381<17> × 274690322498001718403<21> |