C :

#include <stdio.h>
#include <stdlib.h>

int main()
{
    printf("1\n");
    printf(" 2\n");
    printf("  3\n");
    printf("   4\n");
    printf("    5\n");
}

C++ :

#include<iostream>
#include<iomanip>
using namespace std;
int main()
{
	for(int i=1;i<=5;++i)
	  {cout<<setw(i)<<i<<endl;}
	return 0;
}

Pascal :

program p2631;
var
  i,j:integer;
begin
  for i:=1 to 5 do
    begin
      for j:=2 to i do
        write(' ');
      writeln(i);
    end;
end.