Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 488: | \[{15^{488}-1\over14}\] | 26 × 17 × 113 × 367 × 977 × 1489 × 7321 × 234519435023<12> × 1805790344137304843<19> × 259623100099174075793<21> × 220692472927167836907173<24> × 225750890267757624556153<24> × 8830802206297259588001713<25> × 21141468392812504036478395141697<32> × 4671393039173362352129909779480931338369<40> × 66437728342254817921459404330630159646331<41> × 81395548488086772908775498506472824274649<41> × 61282106757642035553042971157061521121002591977<47> × 9256071089239256437520744015295775832826883982617<49> × 3953828536632185447426782287604037623930925945906660885666332144925218256898866858247764449<91> × 21962990745687568955545424955844163278725837819024759577895440207485117639273997024258928841113<95> |