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View Compilation Error

0_0_39651034_10775\Main.java:21: 错误: 找不到符号
                    num = i * i + i + 41;
                    ^
  符号:   变量 num
  位置: 类 Main
0_0_39651034_10775\Main.java:22: 错误: 找不到符号
                    for (int j = 2; j <= Math.sqrt(num); j++) {
                                                   ^
  符号:   变量 num
  位置: 类 Main
0_0_39651034_10775\Main.java:23: 错误: 找不到符号
                        if (num % j == 0)
                            ^
  符号:   变量 num
  位置: 类 Main
3 个错误


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