题解 | 等差数列
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
n=int(input()) print(sum([2+3*i if n >1 else 2 for i in range(n)]))
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
n=int(input()) print(sum([2+3*i if n >1 else 2 for i in range(n)]))
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