Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
187: | \[{3^{187}-1\over2}\] | 23 × 1871 × 3851 × 6359 × 34511 × 1272753542934479<16> × 3411926755457243<16> × 527447346649058852221083363397206345775307<42> |