题解 | #数字颠倒#
等差数列
http://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
a=input() b=int(a) s=0 for i in range(2,b*3,3): s=s+i print(s)
等差数列
http://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
a=input() b=int(a) s=0 for i in range(2,b*3,3): s=s+i print(s)
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