math_fact: 5279 is the number permutations of {1,2,3,...,20} where adjacent numbers differ by no more than 2.
trivia: 5279 is a boring number.
historical_date: June 14th is the day in 1965 that Nguyen Cao Ky became Prime Minister of South Vietnam at the head of a military junta; General Nguyen Van Thieu became the figurehead chief of state.