题解 | #尼科彻斯定理#
尼科彻斯定理
https://www.nowcoder.com/practice/dbace3a5b3c4480e86ee3277f3fe1e85
m = int(input())
a = []
b = 0
start_num = m ** 2 - (m - 1)
a.append(start_num)
for i in range(m-1):
start_num += 2*1
a.append(start_num)
print('+'.join(str(x) for x in a))
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