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  1. #include <iostream>
  2.  
  3. int main() {
  4.     int n;
  5.     std::cout << "Nhap vao so nguyen n: ";
  6.     std::cin >> n;
  7.     long long T = 0;
  8.     int D = 0;
  9.     for (int i = 2; i <= n; i++) {
  10.         bool isPrime = true;
  11.         for (int j = 2; j * j <= i; j++) {
  12.             if (i % j == 0) {
  13.                 isPrime = false;
  14.                 break;
  15.             }
  16.         }
  17.         if (isPrime) {
  18.             T += i;
  19.             D++;
  20.         }
  21.     }
  22.     std::cout << "Tong cac so nguyen to tu 1 den " << n << " la: " << T << std::endl;
  23.     std::cout << "So luong so nguyen to tu 1 den " << n << " la: " << D << std::endl;
  24.     return 0;
  25. }
Success #stdin #stdout 0.01s 5300KB
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stdin
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Standard input is empty
stdout
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Nhap vao so nguyen n: Tong cac so nguyen to tu 1 den 21905 la: 25237919
So luong so nguyen to tu 1 den 21905 la: 2456
https://ideone.com/aqYtTE
bài 4
language:
C++ (gcc 8.3)
created:
14 days ago
visibility:
public

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