Who is the only president of the USA to serve non-consecutive terms?

Question

Who is the only US president to have served two non-consecutive terms and is therefore counted as both the 22nd and 24th president?

Answer 1

Grover Cleveland
Grover Cleveland served as president from 4 March 1885 to 4 March 1889 and 4 March 1893 to 4 March 1897, on either side of Benjamin Harrison's term.