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  1. #include <stdio.h>
  2.  
  3. /* a_n を求める関数（再帰なし） */
  4. int a(int n)
  5. {
  6.     int result = 0;
  7.     int i;
  8.  
  9.     for(i = 1; i <= n; i++) {
  10.         result = result * result + 1;
  11.     }
  12.  
  13.     return result;
  14. }
  15.  
  16. int main(void)
  17. {
  18.     int i;
  19.  
  20.     for(i = 1; i <= 6; i++) {
  21.         printf("a_%d = %lld\n", i, a(i));
  22.     }
  23.  
  24.     return 0;
  25. }
Success #stdin #stdout 0s 5288KB
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stdin
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Standard input is empty
stdout
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a_1 = 1
a_2 = 2
a_3 = 5
a_4 = 26
a_5 = 677
a_6 = 458330
https://ideone.com/ZYDn4R
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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