■類フィボナッチ数列(その11)
F1=1,F2=1
Fn=Fn-1+Fn-2
とすると
F3=2,F4=3,F5=5,F6=8,F7=13,F8=21,F9=34
F10=55,F11=89,F12=144,F13=233,・・・
φ=(1+√5)/2}.−1/φ=(1−√5)/2}
gn=1/√5{φ^n−(−1/φ)^n}=Fn
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{gn}=1,3,8,21,55,144,・・・
gn=1/√5{φ^2n−(−1/φ)^2n}=F2n
{gn}=2,8,34,144,・・・
gn=1/√5{φ^3n−(−1/φ)^3n}=F3n
{gn}=3,21,144,・・・
gn=1/√5{φ^4n−(−1/φ)^4n}=F4n
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