Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 238: | \[{15^{238}-1\over14}\] | 24 × 7 × 137 × 239 × 443 × 953 × 90679 × 1743463 × 10678711 × 1045002649 × 6734509609<10> × 4059968903299<13> × 101462866544971<15> × 54828245908127393269<20> × 6002089885168243417019997239237162279316530053752412376566490597702105104474079032397707<88> × 232680592546117627842582107163535904954168482527537449127806861229228266896928353040947328066221<96> |