我们乐意处理单调递增数列或单调递减数列，因为特别容易确定数列的收敛或发散。
Monotonic sequences are pleasant to work with because their convergence or divergence is particularly easy to determine .
你的输出应该从2992开始到满足需求最大的四位数字结束(数列单调递增)。
Your output is to be 2992 and all larger four-digit Numbers that satisfy the requirements (in strictly increasing order).
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