Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 260: | \[{3^{260}-1\over2}\] | 23 × 52 × 112 × 53 × 61 × 131 × 1181 × 398581 × 797161 × 3701101 × 4795973261<10> × 82669546937641<14> × 110133112994711<15> × 105919308797935444986721<24> × 85515537811724373585467087637721<32> |