Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 195: | \[{28^{195}-1\over27}\] | 3 × 31 × 53 × 131 × 271 × 1483 × 1951 × 15991 × 637421 × 734941 × 72416371 × 219386077 × 2783743024141<13> × 1934714657710381<16> × 4543753614603737<16> × 90216355836698261<17> × 81923931656777716741<20> × 96992972494256001931<20> × 3276407634171096216610291054196844397042681<43> × 16786460532451466327325799382176886017709237013806455658946141974093002768750991359534649071<92> |