题解 | #等差数列#
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
import sys
def do(n):
l_nums = []
# 生成等差数列
for i in range(n):
l_nums.append(2 + (i)*3)
# 求和
return sum(l_nums)
if __name__ == '__main__':
n = int(sys.stdin.readline().strip())
r = do(n)
print(r)
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