□■□ ■□■□■□ ■□■□■□
■□■□■□■□■□■□ ¯
■□■□■□ lcm ( a , b ) = ( a b ) gcd ( a , b ) ■□■□■□
■□■□■□ 1 2 3 three 4 four 5 ■□■□■□