# C Program for Ramanujan-like Number Series

**1729** is known as the **Ramanujan number**, after an anecdote of the British mathematician *G. H. Hardy* when he visited Indian mathematician *Srinivasa Ramanujan* in hospital. He related their conversation:

"I remember once going to see him when he was ill at Putney. I had ridden in taxi cab number 1729 and remarked that the number seemed to me rather a dull one, and that I hoped it was not an unfavourable omen. "No," he replied, "it is a very interesting number; it is the smallest number expressible as the sum of two cubes in two different ways."

The two different ways are:*1729 = 1^3 + 12^3 = 9^3 + 10^3*

(Source: https://en.wikipedia.org/wiki/1729_(number))

Next such number is **4104**.*4104 = 16^3 + 2^3 = 9^3 + 15^3*

I want to find more such numbers. I have tried several time but not able to write code for it. The codes I have written didn't run.

### 1 Answer

Although, You must have shown your work.

Try it:

```
#include <stdio.h>
int main(){
int i, a, b, x, y, k;
printf("Input nos. between which you want to find Ramanujan No.: ");
scanf("%d %d", &a, &b);
for(i=a;i<b;i++){
k=0;
for(x=1;x*x*x<i;x++){
for(y=x+1;y*y*y<i;y++){
if(x*x*x+y*y*y==i){
k++;
x++;
}
}
}
if(k==2){
printf("%d ", i);
}
}
return 0;
}
```

Show us what you have tried,then we will help.stackoverflow.com/help/how-to-ask