Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 133: | \[{15^{133}-1\over14}\] | 7 × 149759 × 229027 × 780179 × 1743463 × 4272113 × 370649274902657<15> × 18536510212629000707955547<26> × 2181105157226630896811634572981263<34> × 8989060546826028227815418496714456884452802834213083<52> |