Triangle Quest 2

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    1. num = b_num = 0
    2. for i in range(1, int(input()) + 1):num = num * 10 + i; b_num = (i - 1) * int(10 ** (i - 2)) + b_num; print(num * int(10 ** (i - 1)) + b_num)
    3. read effectively you find it easy to solve