■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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