Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 173: | \[{19^{173}-1\over18}\] | 5366461 × 4404244108910731<16> × 28933262622870754160910425435012146660907328421<47> × 390232962641934443121909700399101765647541203247373825643163920571476359<72> × 34899542992350301857787803367746606156836220192649180086062867626381729915391069<80> |