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例子
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对于n=6,a(6)=a(2^1*3^1)=a,([1,1,0,0,0,…])=a([0,1,0,1,0,..])+(1+1)*a([1,0,0-0,……])+0=a(3)+2*a(1)=3。
对于n=10,a(10)=a(2^1*5^1)=a[[1,0,1,0,0,0…])=a[[0,0,1,1,0,1,…])+2*0+1*a([0,1,00,0,…]。
对于n=20,a(20)=a(2^2*5^1)=a[2,0,1,0,0,0…])=a[[1,0,1,0,0,0,…])+3*0+1*a([1,1,0,1,…]。
(结束)
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