Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 138: | \[{7^{138}-1\over6}\] | 23 × 3 × 19 × 43 × 47 × 139 × 277 × 3083 × 402011881627<12> × 7396787205469<13> × 31479823396757<14> × 3421093417510114543<19> × 8501948915136155490673<22> × 235169662395069356312233<24> |