题解 | #尼科彻斯定理#

const readline = require("readline");

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
});
rl.on("line", function (line) {
    const n = Number(line);
    let res = [];
    let a = n ** 3 / n - (n - 1); // 根据等差数列的求和公式，得出首项值
    for (let i = 0; i < n; i++) {
        res.push(a);
        a += 2;
    }
    console.log(res.join("+"));
});