Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 398: | \[{5^{398}-1\over4}\] | 2 × 3 × 2389 × 53731 × 75223 × 44656987140518535039596003383<29> × 258477886375764930647353872316066590222941528747358506038162620747129373479612613318712406500802052921<102> × 57908984365274624584914333008692600552662821915850878758083011806868463587457738002121166767096402607032872918381590535488973250751801<134> |