题解 | #等差数列#
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
n=int(input()) list1=list(i for i in range(2,3*n,3)) print(sum(list1))
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
n=int(input()) list1=list(i for i in range(2,3*n,3)) print(sum(list1))
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