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  1. #include <stdio.h>
  2.  
  3. int c = 0;
  4.  
  5. // rec関数の定義
  6. int rec(int n) {
  7.  
  8.     if (n == 0) {
  9.         return 3;
  10.     } else if (n == 1) {
  11.         return 0;
  12.     } else if (n == 2) {
  13.         return 2;
  14.     } else {
  15.  
  16.         return rec(n - 2) + rec(n - 3);
  17.     }
  18. }
  19.  
  20. int main(void) {
  21.     int n = 50;
  22.  
  23.     for (int i = 1; i <= n; i++) {
  24.         int value = rec(i);
  25.         if (value % i == 0) {
  26.             c++;
  27.         }
  28.     }
  29.  
  30.  
  31.     printf("Total count of n where a(n) is divisible by n: %d\n", c);
  32.  
  33.     return 0;
  34. }
  35.  
Success #stdin #stdout 0.01s 5276KB
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stdin
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Standard input is empty
stdout
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Total count of n where a(n) is divisible by n: 16
https://ideone.com/zzTPKP
language:
C (gcc 8.3)
created:
2 days ago
visibility:
public

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