Display all NCBI genes and links to identifier website

Database: 
Statement: 

Display all NCBI genes and links to identifier website. A limit results per page $number$ .

Query: 
select ?identifier ?URL where { ?s<http://www.w3.org/1999/02/22-rdf-syntax-ns#type><http://bio2rdf.org/ncbigene_vocabulary:Resource>. ?s<http://purl.org/dc/terms/identifier>?identifier . ?s<http://bio2rdf.org/bio2rdf_vocabulary:x-identifiers.org> ?URL . } limit ??number
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