Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 220: | \[{15^{220}-1\over14}\] | 25 × 112 × 23 × 31 × 67 × 113 × 331 × 463 × 617 × 1531 × 2333 × 4931 × 8537 × 19421 × 131381 × 1011671 × 23504771357<11> × 3438685189501<13> × 58925748316711<14> × 1758543013624537801<19> × 536554814380116068153<21> × 9273757272736041033417670310849312570581<40> × 12280799626907257732259519604601968471234939012585732801224243979285193111479225123735849609601<95> |