Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
143: | \[{5^{143}-1\over4}\] | 12207031 × 305175781 × 24615836446631<14> × 53130566763791958299<20> × 460183952753824357170225842292658707895690816315909<51> |