令A=ceiling(sqrt(2N+1/4)+1/2)
令B=(A-2)(A-1)/2
分母是:A
分子是:N-B
ceiling()是向上取整函数,例如:
ceiling(0.2)=1
ceiling(3.99)=4
ceiling(5)=5
sqrt()是开平方函数,例如:
sqrt(1)=1
sqrt(2)=1.41421...
sqrt(4)=2
则第N个数为:((ceiling(sqrt(2N+1/4)+1/2)-2)(ceiling(sqrt(2N+1/4)+1/2)-1)/2)/ceiling(sqrt(2N+1/4)+1/2)
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