Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 387: | \[{3^{387}-1\over2}\] | 13 × 431 × 757 × 4129 × 2199072289 × 308842594561<12> × 380808546861411923<18> × 269123363760531549673<21> × 912851565662857110894244969<27> × 19883793469378176373136546038842994063371691807806092869125056219155739754744344670610513<89> |