Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
263: | \[{5^{263}-1\over4}\] | 1523516701711<13> × 1107143537725947554658689059451849829090471252205614087123978608799086801542722844666199767976329692508527664624067804441860133113756105745980602226962031213112972265487621<172> |