#include <stdio.h>
int main()
{
    int rows, i, j, num= 1;

     printf("Enter number of rows: ");
    scanf("%d",&rows);

     for(i=1; i <= rows; i++)
    {
        for(j=1; j <= i; ++j)
        {
            printf("%d ", num);
            ++num;
        }

         printf("\n");
    }

     return 0;
}

 OUTPUT : 

 Enter number of rows: 4

 1
23
456
78910



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