Base 13 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 83: | \[{13^{83}-1\over12}\] | 12451 × 1383113 × 1386931777883518057046869588983880892136291513972206972463883515737484028199438341<82> |