// i: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, ...
// s(i): 1, 3, 4, 7, 6, 12, 8, 15, 13, 18, ...
// s(i) = sigma(i), the sum of the divisors of i
// Develop a C++ program to output n first elements of the sequence 1, 3, 4, 7, 6, ...
#include <iostream>
using namespace std;
int i, j, k, l, m, n, s;
int main()
{
cin >> n;
cout << "n=" << n << endl;
for (i = 1; i <= n; i++) cout << i << '\t';
cout << endl;
for (i = 1; i <= n; i++) {
s = 0;
for (j = 1; j <= i; j++) {
k = i / j;
m = k * j;
if (i == m) s = s + j;
}
cout << s << '\t';
}
return 0;
}
Ideone.com - XTivZx - Online C++ Compiler & Debugging Tool
Computer Methods in Science Course
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