Вот только валидатор хочет иного решения?
package com.javarush.task.task20.task2025;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
/*
Алгоритмы-числа
*/
public class Solution {
public static long[] numbers = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 153, 370, 371, 407, 1634, 8208, 9474,
54748, 92727, 93084, 548834, 1741725, 4210818, 9800817, 9926315, 24678050,
24678051, 88593477, 146511208, 472335975, 534494836, 912985153, 4679307774L};
public static long[] getNumbers(long N) {
List<Long> list = new ArrayList<>();
for (int i = 0; i < N; i++) {
if (numbers[i] <= N) {
list.add(numbers[i]);
} else break;
}
long[] result = new long[list.size()];
for (int i = 0; i < list.size(); i++) {
result[i] = list.get(i);
}
return result;
}
public static void main(String[] args) {
long a = System.currentTimeMillis();
System.out.println(Arrays.toString(getNumbers(1000)));
long b = System.currentTimeMillis();
System.out.println("memory " + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / (8 * 1024));
System.out.println("time = " + (b - a) / 1000);
a = System.currentTimeMillis();
System.out.println(Arrays.toString(getNumbers(1000000)));
b = System.currentTimeMillis();
System.out.println("memory " + (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / (8 * 1024));
System.out.println("time = " + (b - a) / 1000);
}
}