Base 29 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 81: | \[{29^{81}-1\over28}\] | 13 × 67 × 487 × 14437 × 41203 × 52813 × 2284147 × 27738169741<11> × 1744612878442321<16> × 344856901106881202956291<24> × 2000995917510777253152619484149543977577903<43> |