Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 258: | \[{5^{258}-1\over4}\] | 2 × 32 × 7 × 31 × 1549 × 9547 × 18471511 × 327845761 × 558801427 × 1420986601 × 1644512641 × 7866608083<10> × 1628744948329<13> × 172827552198815888791<21> × 43955934961951833386625799<26> × 51349797354047205216257689<26> × 236419892853700126919767791480523<33> |