Base 13 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 88: | \[{13^{88}-1\over12}\] | 23 × 5 × 7 × 17 × 23 × 89 × 419 × 859 × 5281 × 6073 × 14281 × 18041 × 128011456717<12> × 3577574298489429481<19> × 668229430151772307653060812800711311233<39> |