Fusc ← {
  {
   𝕩∾+´(⍷(⌈∾⌊)2÷˜≠𝕩)⊑¨<𝕩
  }⍟(𝕩-2)↕2
}

•Show Fusc 61

•Show >⟨"Index"‿"Number"⟩∾{((1+↕4)⊐˜(⌊1+10⋆⁼1⌈|)¨𝕩){𝕨∾𝕨⊑𝕩}¨<𝕩} Fusc 99999