Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 277: | \[{3^{277}-1\over2}\] | 15801743 × 478803193369<12> × 96093835737198987630852488215668046851137095982583744906497662037435603571748141245792156421257518028298294596143<113> |