Number pattern : Pyramid of square of 1 to 25

                  1  
              4   9  16 
         25  36  49  64  81 
    100 121 144 169 196 225 256 
289 324 361 400 441 484 529 576 625

#include<stdio.h>

int main()
{
 int i, j, k=1;
 for(i=1;i<=5;i++)
 {
 for(j=i;j<5;j++)
 {
 printf(" ");
 }
 for(j=1;j<(i*2);j++)
 {
 printf("%3d ",k*k);
 k++;
 }
 printf("\n");
 }
 return 0;
}