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