Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 169: | \[{18^{169}-1\over17}\] | 79 × 521 × 4057 × 29759719289<11> × 198383812344828058391<21> × 4307879238838868183806405247<28> × 563915195408451484310296017487<30> × 8921092532746312807529605079688457<34> × 380981769660353078098207129969796177543646195911959992563382703831365300022620151<81> |