题解 | #等差数列#
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
while True: try: n = int(input()) sum = int(((3 * n + 1) * n) / 2) print(sum) except: break
等差数列
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
while True: try: n = int(input()) sum = int(((3 * n + 1) * n) / 2) print(sum) except: break
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