题解 | #等差数列#笨办法
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
n = int(input())
x=[]
y=2
x.append(y)
for a in range(1,n):
y=y+3
x.append(y)
print(sum(x))
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
n = int(input())
x=[]
y=2
x.append(y)
for a in range(1,n):
y=y+3
x.append(y)
print(sum(x))
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