2 to N primes in SCSS

prime.scss

// ----
// Sass (v3.4.21)
// Compass (v1.0.3)
// ----

@function is_prime($num, $sqrt) {
  @for $i from 3 through $sqrt {
    @if $num % $i == 0 {
      @return false;
    }
  }
  @return true;
}

@mixin list_prime($max) {
    .No_1 { value: 2; }
    .No_2 { value: 3; }
    
    $index: 2;
    $sqrt: 3;
    
    @for $num from 5 through $max {
      @while $sqrt * $sqrt <= $num {
        $sqrt: $sqrt + 1;
      }

      @if $num % 2 != 0 {
        @if is_prime($num, $sqrt) {
          $index: $index + 1;
          .No_#{$index} { value: $num; }
        }
      }
    }
}
@include list_prime(1000);

https://www.sassmeister.com/gist/9af693ad2f079926e02858cb226f086c