Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 261: | \[{15^{261}-1\over14}\] | 59 × 241 × 349 × 523 × 541 × 2089 × 21061 × 798084409 × 15476275967141572773889537007699<32> × 2434454875515985938258837058986771053264041318453337821<55> × [350560269108646745927786544271181812218027186650701257023097701094010188800032522272917797062806754840909292662637823844631207552786292837123796674390024575472994761985290231678659628299971883<192>] |