Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
171: | \[{3^{171}-1\over2}\] | 13 × 229 × 757 × 1597 × 119701 × 248749 × 363889 × 1824179209 × 27203787889921135221329070240968055313746007669<47> |