Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 220: | \[{5^{220}-1\over4}\] | 22 × 3 × 112 × 13 × 23 × 41 × 67 × 71 × 89 × 521 × 5281 × 9161 × 103511 × 245521 × 511831 × 1458601 × 12207031 × 65628751 × 190295821 × 1030330938209<13> × 2802204291103029121<19> × 85725237432926769781584361<26> × 10910444855403996246103496881<29> |