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  1. #include <stdio.h>
  2.  
  3. int main() {
  4.     int limit = 20;
  5.     int numbers_found = 0;
  6.     printf("searching for ramanujan numbers with components up to %d...\n", limit);
  7.  
  8.     for(int a=1; a<=limit; a++){
  9.         for(int b=a; b<=limit; b++){
  10.             int sum1 = (a*a*a) + (b*b*b);
  11.             for(int c=a+1; c<=limit; c++){
  12.                 for(int d=c; d<=limit; d++){
  13.                     int sum2 = (c*c*c) + (d*d*d);
  14.                     if(sum1 == sum2){
  15.                         printf("\n found one! --> %d\n", sum1);
  16.                         printf(" As: %d^3 + %d^3\n", a, b);
  17.                         printf(" And as: %d^3 + %d^3\n", c, d);
  18.                         numbers_found++;
  19.                     }
  20.                 }
  21.             }
  22.         }
  23.     }
  24.  
  25.     if(numbers_found == 0){
  26.         printf("No ramanujan number is found within the limit\n");
  27.     }
  28.  
  29.     return 0;
  30. }
  31.  
Success #stdin #stdout 0s 5316KB
comments (?)
stdin
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1729
stdout
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searching for ramanujan numbers with components up to 20...

 found one! --> 1729
 As: 1^3 + 12^3
 And as: 9^3 + 10^3

 found one! --> 4104
 As: 2^3 + 16^3
 And as: 9^3 + 15^3
https://ideone.com/QqdmPQ
language:
C (gcc 8.3)
created:
9 days ago
visibility:
public

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