设D是无平方因子正整数,A(D)是D的Pell伴随数列.运用Pell方程的基本性质,给出了数列A(D)含有三角数的一些必要条件,并证明了:当D≤20时,数列A(D)仅当D-2,11,14时含有三角数.
Let D be a positive integer with square free, let A(D) denote the associated Pell sequence of D. Using some basic properties of Pell equation, certain necessary conditions for A (D) contains triangular numbers are given. Moreover, It was proved that, for D≤20, the sequence A(D) contains triangular numbers if and only if D=2, 11 and 14.