Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
129: | \[{15^{129}-1\over14}\] | 241 × 1549 × 3109274247465857390281<22> × 26656068987980386414408582952871386493955339704241<50> × 119983296159419386406934525940047822661513129865720754215156469557046614269<75> |