题解 | #等差数列#
等差数列
http://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
let n = +readline();
let sum = 0;
for(let i = 1; i <= n; i++) {
sum += i * 3 - 1;
}
console.log(sum);
等差数列
http://www.nowcoder.com/practice/f792cb014ed0474fb8f53389e7d9c07f
let n = +readline();
let sum = 0;
for(let i = 1; i <= n; i++) {
sum += i * 3 - 1;
}
console.log(sum);
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