■ラマヌジャンの恒等式（その１７）
an^3+bn^3=cn^3+(-1)^n
[an+1]=[63,104,-68][an]
[bn+1]=[64,104,-67][bn]
[cn+1]=[80,131,-85][cn]
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[an+1]=[63,104,-68]^n[1]
[bn+1]=[64,104,-67] [2]
[cn+1]=[80,131,-85] [2]
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9^3+10^3=12^3+1^3
an^3+bn^3=cn^3+(-1)^n+1
[an+1]=[63,104,-68][an]
[bn+1]=[64,104,-67][bn]
[cn+1]=[80,131,-85][cn]
9^3+10^3=12^3+1^3
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[an+1]=[63,104,-68]^n[-1]
[bn+1]=[64,104,-67] [2]
[cn+1]=[80,131,-85] [2]
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