Base 13 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 115: | \[{13^{115}-1\over12}\] | 1381 × 30941 × 3344431 × 1309485451 × 2519545342349331183143<22> × 22430096835950229486714793063584344770630749351289193288759273757529000808589290941<83> |