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  1. #include <stdio.h>
  2.  
  3. int rec(int n) {
  4.     if (n == 1) return 3;
  5.     if (n == 2) return 0;
  6.     if (n == 3) return 2;
  7.     return rec(n - 2) + rec(n - 3);
  8. }
  9.  
  10. int main(void) {
  11.     int a;
  12. 	for (int n = 1; n <= 50; n++) {
  13.         a = rec(n);
  14.         if (n != 0 && a % n == 0) {  // n=0は除外
  15.             printf("n = %d (a%d = %d)\n", n, n, a);
  16.         }
  17.     }
  18.  
  19.     return 0;
  20. }
  21.  
Success #stdin #stdout 0.01s 5324KB
comments (?)
stdin 
Standard input is empty
stdout 
n = 1 (a1 = 3)
n = 2 (a2 = 0)
n = 30 (a30 = 3480)
https://ideone.com/eQDjvx
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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