题解 | #尼科彻斯定理# 来告诉大家怎么看出规律

另外 m(m-1) 是偶数 所以x必是奇数不用多说吧[狗头]

m = int(input())

x = m**2-m+1
out = []
for i in range(m):
    out.append(x+2*i)

temp = [str(i) for i in out]
print("+".join(temp))