Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
98: | \[{5^{98}-1\over4}\] | 2 × 3 × 29 × 449 × 19531 × 49105547 × 1866013003 × 2481357870461<13> × 227376585863531112677002031251<30> |