According to HN search, SICP was mentioned >5000 times over the past year: <a href="https://hn.algolia.com/?query=sicp&sort=byPopularity&prefix=false&page=0&dateRange=pastYear&type=comment" rel="nofollow">https://hn.algolia.com/?query=sicp&sort=byPopularity&prefix=...</a><p>So I'm guessing the number for 2017 was similar.