Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
54: | \[{15^{54}-1\over14}\] | 24 × 19 × 109 × 211 × 241 × 541 × 739 × 811 × 21061 × 16354441 × 829049498029<12> × 1477891879996957031251<22> |