Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 260: | \[{15^{260}-1\over14}\] | 25 × 11 × 31 × 53 × 79 × 113 × 131 × 1531 × 4931 × 11909 × 16433 × 18617 × 19421 × 37181 × 131381 × 157483 × 185641 × 16655159 × 30313817 × 64190881 × 151747597 × 1294671691 × 25255508981<11> × 770171718941<12> × 1539711288259<13> × 118991428865318211233461<24> × 1962154744388953230433591<25> × 1109073007898479903020404239299581<34> × 8439460027351897867644060550411592674801<40> × 2019047273585208433900886541315654544678694069335036331<55> |