题解 | #等差数列#
https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
n = input()
num = 2
sum = 0
for i in range(eval(n)):
sum = sum + num
num +=3
print(sum)https://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
n = input()
num = 2
sum = 0
for i in range(eval(n)):
sum = sum + num
num +=3
print(sum)相关推荐