Is there a jurisdiction that allows purely algorithms to be copyrighted? As far as I know, usually algorithms come under the umbrella of patents (in jurisdictio

Is there a jurisdiction that allows purely algorithms to be copyrighted? As far as I know, usually algorithms come under the umbrella of patents (in jurisdictions that allow software patents) rather than copyright. For example, it would interfere with e.g. copyright of scientific/mathematical papers if algorithms were copyrightable, as mathematicians would not be able to extend another mathematician’s ideas without first gaining permission.