// Setup the function in your functions or helpers files, wherever you keep these bits.
@function headings($from:1, $to:6, $prefix:"") {
    @if $from == $to {
        @return $prefix + ' h#{$from}';
    } @else {
        @return $prefix + 'h#{$from},' + headings($from+1, $to, $prefix);
    }
}
