Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
217: | \[{3^{217}-1\over2}\] | 683 × 1093 × 20399 × 102673 × 4404047 × 24040333283<11> × 20545698698839917414079969<26> × 5042697757897197583937774496999119335532852173<46> |