e/Polite number

Information
has gloss	eng: In number theory, a polite number is a positive integer that can be written as the sum of two or more consecutive positive integers. Other positive integers are impolite. Polite numbers have also been called staircase numbers because the Young diagrams representing graphically the partitions of a polite number into consecutive integers (in the French style of drawing these diagrams) resemble staircases. If all numbers in the sum are strictly greater than one, the numbers so formed are also called trapezoidal numbers because they represent patterns of points arranged in a trapezoid.
lexicalization	eng: polite number
lexicalization	eng: Staircase number
lexicalization	eng: Trapezoidal number
instance of	(noun) a four-sided polygon tetragon, quadrilateral, quadrangle

Media
media:img	Young 456 French.svg