■数とあそぶ(その25)
πの連分数展開は
π=[3:7,15,1,292,・・・]
これから,近似値
3,22/7,333/106,355/113,103993/33102,・・・
が得られる.
√2の連分数展開は
√2=[1:2,2,2,2,・・・]
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2π√2=8.88576→8
1/.88576=1.12898→1
1/.12898=7.75338→7
1/.75338=・・・
を続けると
[8:1,7,1,3,15,1,1,3,3,2,・・・]
8+1/(1+1/7)=8+7/8
8+1/(1+1/(7+1/1))=8+8/9
8+1/(1+1/(7+1/(1+1/3)))=8+31/35
8+1/(1+1/(7+1/(1+1/(3+1/15))))=8+473/519
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