NEW YORK (AP) — New York City’s billionaire mayor is using his personal fortune to try to spark innovation in the nation’s cities — inviting 1,300 mayors to compete for millions of dollars in funding for new programs meant to solve urban challenges and enhance city life.

The mayors of U.S. municipalities with at least 30,000 residents will be asked to join the Mayors Challenge, being launched Wednesday by Bloomberg Philanthropies, which is offering a grand prize of $5 million and four smaller prizes of $1 million. The foundation is asking the mayors to focus on initiatives that could be replicated elsewhere if successful.