Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 128: | \[{19^{128}-1\over18}\] | 28 × 5 × 17 × 97 × 181 × 3833 × 15073 × 36097 × 87553 × 151681 × 563377 × 1486811410142377153<19> × 315989504252280687606137174469121<33> × 274254682725217636458847635846091201<36> × 3465657707570606956932512392503718320001<40> |