Looking at https://dumps.wikimedia.org/enwiki/20170501/ you can find:
2017-05-03 07:26:20 done List of all page titles https://dumps.wikimedia.org/enwiki/20170501/enwiki-20170501-all-titles.gz (221.7 MB) 2017-05-03 07:22:02 done List of page titles in main namespace https://dumps.wikimedia.org/enwiki/20170501/enwiki- 20170501-all-titles-in-ns0.gz (70.8 MB)
If you want to do analysis of namespaces and redirects on your own, you can also use: https://dumps.wikimedia.org/enwiki/20170501/enwiki-20170501-page.sql.gz It is larger, but you can filter by columns page_is_redirect and page_namespace on your own terms.