Base 13 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 220: | \[{13^{220}-1\over12}\] | 22 × 52 × 7 × 112 × 17 × 23 × 419 × 421 × 601 × 641 × 661 × 859 × 2411 × 2861 × 5281 × 18041 × 30941 × 53681 × 128011456717<12> × 4439770467824561<16> × 13545148572117361<17> × 3577574298489429481<19> × 4122652482568228291<19> × 159781905331924011841<21> × 202254724516962030101<21> × 8603427927040724342317061<25> × 221090330333352121547996226952843328713749836425081<51> |