Greatest common divisor function in SASS

gcd.sass

@function gcd($a, $b) {
  @if $b == 0 {
    @return $a;
  }
  
  @return gcd($b, $a%$b);
}

@for $i from 1 through 11 {
  @for $j from $i+1 through 12 {
    @if gcd($i, $j) == 1 {
      .cell-#{$i}_#{$j} {
        width: percentage($i/$j);
      }
    }
  }
}