Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 206: | \[{31^{206}-1\over30}\] | 25 × 619 × 1031 × 7417 × 88368851 × 1278383012006645095427<22> × 228852111433810636140979007219<30> × 3269732036867196542633009968685892492461<40> × 350095877602582444216618272982250341502313669637<48> × 123550873822084008134036421926999651849652790013694815262143130517260972161844597839457113637501287658331220064572689730472752008174773724756275534401<150> |