Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 409: | \[{3^{409}-1\over2}\] | 20720759 × 145724851390704755159<21> × 149201935333301250525828683<27> × 1541166099877471105470762310690414692655571732229852213712839041440378579810339805474536294932158495016383690431179982864627366826365925051267<142> |