About: http://webisa.webdatacommons.org/218334028

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	This problem was proposed long ago on some Russian high school competition, but nobody managed to solve, including jury.
http://www.w3.org/ns/prov#wasQuotedFrom	mathoverflow.net