F  ← ˜∧(◴⊂⊸×)¤1°/× # Factors ? Num
P! ← ⊙◌⍢+₁(>/+^)1
⊃P!(×₁₀F)P!(×₁₁▽≤50⤚÷⊸F)⋕&fras"i/20.in"

~/aoc15ua/20