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一个有趣的数列题

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  •   adcen · Nov 10, 2017 via Android · 2419 views
    This topic created in 3130 days ago, the information mentioned may be changed or developed.

    122333444455555666666 an=[((√8n － 7)－ 1)/2]－ 1 如何证明？

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    2 replies  •  2017-11-10 12:28:21 +08:00
    adcen
        1
    adcen  
    OP
       Nov 10, 2017 via Android
    问题是如何推出通项
    xml123
        2
    xml123  
       Nov 10, 2017
    an=round(sqrt(2*n))
    根据增长率拟合一下系数就行了
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