Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
223: | \[{7^{223}-1\over6}\] | 17288166877<11> × 132218621369<12> × 20877096675094797264239507808397135781888542805177032437377478507094429809306858678069385462043489058048576190172148190745839156287600063244339413744530579496858763589<167> |