Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
137: | \[{5^{137}-1\over4}\] | 20551 × 603349 × 48102071 × 121719631478506669<18> × 7851027307722624763151<22> × 251755028858658462627642052961230751431<39> |