Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 361: | \[{3^{361}-1\over2}\] | 1597 × 103969 × 363889 × 930643561 × 1544679802763873663<19> × 212442076518129661950839<24> × 675873510595715629396212612371<30> × 697971097942205936103528761635014959698831304436244414154743826104885908192839<78> |