Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
60: | \[{15^{60}-1\over14}\] | 25 × 11 × 13 × 31 × 61 × 113 × 211 × 241 × 1531 × 3877 × 4931 × 19231 × 19421 × 33601 × 131381 × 142111 × 278041 × 39225301 × 706195561 |