Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 97: | \[{19^{97}-1\over18}\] | 350286401 × 11542175764721536214759<23> × 2406871247546906126235451908529<31> × 62468771853453988907994855172682616050526469382576404972295431<62> |