Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 180: | \[{15^{180}-1\over14}\] | 25 × 11 × 13 × 19 × 31 × 37 × 61 × 113 × 181 × 211 × 241 × 541 × 739 × 811 × 991 × 1531 × 3877 × 4931 × 19231 × 19421 × 21061 × 33601 × 47701 × 131381 × 142111 × 278041 × 318601 × 2568061 × 39225301 × 706195561 × 2911460401 × 3506657472973<13> × 138711479680351<15> × 105091981250955481<18> × 2907052472739605948143921<25> × 92978587355640205970336221<26> |