doctora@DoctorA-new:~/src/my$ cat matrix.c
#include <stdio.h>

int main(){
  int input;
  printf("enter a number:");
  scanf("%d",&input);
  printf("you entered %d\n",input);
  int i=0;
  int j=0;
  int k=0;
  for(i=1;i<=input;i++){
    printf("%d",i);
    k=i;
    for(j=1;j<input;j++){
      k++;
      printf(" %d",k);
    }
    printf("\n");
  }
}