Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
253: | \[{5^{253}-1\over4}\] | 8971 × 12207031 × 215556321311<12> × 332207361361<12> × 4586605887769406257148888900423581<34> × 75458741165755163938354406143932160485170968091<47> × 63639858661524160076707327760542007934944636560107530801798041<62> |