■トリボナッチ数列(その22)
【2】kフィボナッチ数列の周期性の解析
A=[0,1]
[1,1]
の拡張行列は
A3 =[0,1,0],A4 =[0,1,0,0]
[0,0,1] [0,0,1,0]
[1,1,1] [0,0,0,1]
[1,1,1,1]
となり,kフィボナッチ数列の周期性の解析に応用することができる.
トリボナッチ数列に対しては
A3^n =[Fn-2,Fn-2+Fn-3,Fn-1]
[Fn-1,Fn-1+Fn-2,Fn ]
[Fn ,Fn +Fn-1,Fn+1]
テトラナッチ数列に対しては
A4^n =[Fn-3,Fn-3+Fn-4,Fn-3+Fn-4+Fn-5,Fn-2]
[Fn-2,Fn-2+Fn-3,Fn-2+Fn-3+Fn-4,Fn-1]
[Fn-1,Fn-1+Fn-2,Fn-1+Fn-2+Fn-3 Fn ]
[Fn ,Fn +Fn-1,Fn +Fn-1+Fn-2,Fn+1]
となる.
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