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List<Integer> eratosthenesSieve(int n) {
    List<Integer> res = new ArrayList<>();
    for (int i = 2; i <=n; i++) {
        if (p(i)) res.add(i);
    }
    return res;
}
boolean p(int a) {
    for (int i = 2; i < a; i++) {
        if (a % i == 0) return false;
    }
    return true;
}