Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 275: | \[{3^{275}-1\over2}\] | 113 × 23 × 1321 × 3851 × 8951 × 391151 × 560088668384411<15> × 121083372541491664042201<24> × 2184618099425061500147268880843478755794738604041083109375948881000595001<73> |