Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 220: | \[{3^{220}-1\over2}\] | 23 × 52 × 113 × 23 × 61 × 67 × 661 × 1181 × 1321 × 3851 × 5501 × 177101 × 570461 × 659671 × 24472341743191<14> × 560088668384411<15> × 927319729649066047885192700193701<33> |