题解 | #等差数列#
等差数列
http://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
n = int(input()) total=0 for i in range(n): total+=(2+3*i) print(total)
等差数列
http://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
n = int(input()) total=0 for i in range(n): total+=(2+3*i) print(total)
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