Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 99: | \[{15^{99}-1\over14}\] | 67 × 241 × 463 × 541 × 2333 × 5347 × 8537 × 21061 × 55243 × 62475406423<11> × 4969143820807<13> × 1741078786797952487623<22> × 71472830417465766173099456354984223218647<41> |