Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 205: | \[{15^{205}-1\over14}\] | 11 × 4931 × 7928581 × 173006881 × 8430332222527<13> × 14052995136749824817978552692323583<35> × 7959780830456631849195394126814830695660223678260928174262987398564636675917709381<82> × 12778469585531068908462095421146632714382006066000659511627112734710640184892903246160216521<92> |