function getSum(a, b){
    return (Math.max(a, b) - Math.min(a, b) + 1) * (Math.min(a, b) + Math.max(a, b)) / 2;
}

downloadDownload PNG downloadDownload JPEG downloadDownload SVG

Tip: You can change the style, width & colours of the snippet with the inspect tool before clicking Download!

Click to optimize width for Twitter