Pagination for SEO

with rel=“next” and rel=“prev”

From an SEO perspective, pagination can cause serious issues with Google’s ability to index your site’s content.

To ease things when a robot read your page2, you may mention page 1 & 3 using below tags in head.

<link rel="prev" href="http://www.site.com/page1.html">
<link rel="next" href="http://www.site.com/page3.html">

Detailed info