Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
125: | \[{3^{125}-1\over2}\] | 112 × 251 × 8951 × 391151 × 358291751 × 14781691751<11> × 391632555001<12> × 989947158849251<15> |