Information About

Integer-valued Polynomial




t(t + 1)/2


giving the Triangle Number s takes on integer values whenever ''t = n'' is an integer. That is because one out of ''n'' and ''n'' + 1 must be an Even Number .

In fact integer-valued polynomials can be described fully. Inside the Polynomial Ring ''Q'' {Link without Title} of polynomials with Rational Number coefficients, the Subring of integer-valued polynomials is a Free Abelian Group . It has as basis the polynomials

Pk


for ''k'' = 0,1,2, ... .