Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 207: | \[{28^{207}-1\over27}\] | 32 × 192 × 47 × 139 × 271 × 277 × 444979 × 1255663 × 224727078564911869<18> × 12804209632826426107<20> × 3421102302281649284721873631<28> × 1517655145813456319033978812579<31> × 527264972197836529557199851838274216840527<42> × 1925078388410563740723018059030405962910674239939823341742747378400676230238593717890542613330824987685099843255127224364411624053836828259<139> |