Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 159: | \[{28^{159}-1\over27}\] | 3 × 271 × 220187971 × 90349859930791199292781650091017442339736481601467694712401<59> × 8418181933268901359893212846689066832649574728174313094689465758991<67> × 34098344412497019428827800803396486479964268642290314685700694413198542325108441377613660181<92> |