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  1. #include <stdio.h>
  2.  
  3. int main(void) {
  4. 	int a=2,n,x=1; //nを項数とする。//
  5. 	scanf("%d",&n);
  6. 	while(x!=n){
  7. 		a = 2+a*3;
  8. 		x = x+1;
  9.  
  10. 	}
  11. 	printf("初項から第%d項までの和は%d",n,a);
  12.  
  13. 	return 0;
  14. }
  15.  
Success #stdin #stdout 0s 5240KB
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4
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初項から第4項までの和は80
https://ideone.com/grBs6Q
language:
C (gcc 8.3)
created:
3 days ago
visibility:
public

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