Asequencea1,a2...ofnon-negativeintegersisdefinedbytherulean+2=|an+1-an|forn>=1ifa1=999,a2有一组非负整数数列：a1,a2....满足An+2=|An+1-An|(n>=1),并且a1=999时，a2

Question

A sequence a1,a2...of non-negative integers is defined by the rule an+2=|an+1 - an| for n>=1 if a1=999,a2
有一组非负整数数列：a1,a2....满足An+2=|An+1-An|(n>=1),并且a1=999时，a2

Answer 1

有一组非负整数数列：a1,a2.满足An+2=|An+1-An|(n>=1),并且a1=999时,a2