题解 | #等差数列python3#
等差数列
http://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
while True:
try:
x = int(input())
s = 0
for i in range(x):
s += i*3 + 2
print(int(s))
except:
break
等差数列
http://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
while True:
try:
x = int(input())
s = 0
for i in range(x):
s += i*3 + 2
print(int(s))
except:
break
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