program bai_1;
uses crt;
var i,n,j,d,dem:word;
begin
  clrscr;
  repeat
    write('nhap n:');readln(n);
    if (n<=0)or(n>=10000)then writeln('so ban nhap khong hop le, ban hay nhap lai:');
  until (n>0)and(n<10000);
  writeln('cac uoc so la so tu nhien cua ',n,' la:');
  for i:=1 to n do
  if n mod i=0 then write(i,'    ');
  writeln;
  dem:=0;
  for i:=2 to n do
  begin
    d:=0;
    for j:=2 to i div 2 do
    if i mod j=0 then inc(d);
    if (d=0)and(n mod i=0)then inc(dem);
  end;
  if dem>0 then writeln('cac uoc so la so nguyen to cua ',n,' la:');
  begin
    d:=0;
    for j:=2 to i div 2 do
    if i mod j=0 then inc(d);
    if (d=0)and(n mod i=0)then write(i,'    ');
  end;
  if dem=0 then write(0);
  readln;
end.

Câu 1:

Program HOC24;

var i,p: integer;

t: longint;

begin

write('Nhap P: '); readln(p);

t:=0;

for i:=1 to p do if i mod 2<>0 then t:=t+i;

write('Tong cac so le la: ',t);

readln

end.

Câu 2:

Program HOC24;

var i,n: integer;

t: longint;

begin

write('Nhap N: '); readln(n);

t:=0;

for i:=1 to n do if i mod 2=0 then t:=t+i;

write('Tong cac so chan la: ',t);

readln

end.

Câu 3:

Program HOC24;

var i,t,n: integer;

begin

write('Nhap N: '); readln(n);

t:=0;

for i:=1 to n do if n mod i=0 then t:=t+i;

write('Tong cac uoc cua ',n,' la: ',t);

readln

end.

Tham khảo:

program tim_uoc;
uses crt;
var n,i:integer;
begin
clrscr;
write('Nhap n: ');readln(n);
if (n<0) then 
begin
writeln('So nhap vao khong thoa man.');
write('Nhap lai n: ');readln(n);
end;
writeln('Cac uoc so cua ',n,' tu 1 den ',n,' la: ');
for i:=1 to n do
if ( (n mod i) = 0 ) then write(i,'  ');
readln;
end.

program TongUoc;

uses crt;

var
  N, i, Tong: integer;

begin
  clrscr;
  Tong := 0;
  write('Nhap so tu nhien N: ');
  readln(N);

  // Tinh tong cac uoc cua N
  for i := 1 to N do
  begin
    if N mod i = 0 then
    begin
      Tong := Tong + i;
    end;
  end;

  writeln('Tong cac uoc cua ', N, ' la: ', Tong);

  readln;
end.

Câu 1: 

program chieu_cao;

uses crt;

var Nam, Linh: real;

begin

clrscr;

write ('Nhap chieu cao cua Nam:'); readln (Nam);

write ('Nhap chieu cao cua Linh:'); readln (Trang);

if Nam > Linh then writeln ('Ban Nam cao hon');

if Nam < Linh then writeln ('Ban Linh cao hon') else writeln ('Hai ban cao bang nhau');

readln

end.

Câu 2: 

program Tich;

var N,i: interger;

      P: longint;

begin

write ('N='); readln (N);

P:=1;

for i:=1 to N do P:=P*i;

writeln (N,' ! = ',P);

readln

end.

Câu 3: 

uses crt;

var n,i,s:longint;

begin

clrscr;

readln(n);

for i:=1 to 10 do 

  writeln(n,'*',i,'=',n*i);

readln;

end.

1. Uses crt;

var n,i: integer;

begin clrscr;

readln(n);

for i:=1 to n do write(i:3);

readln;

end.

2. Uses crt;

var n,i: integer;

begin clrscr;

readln(n);

for i:=1 to n do if(i mod 2 = 0) then write(i:3);

readln;

end.

1. Uses crt;

var n,i: integer;

begin clrscr;

readln(n);

for i:=1 to n do write(i:3);

readln;

end.

2. Uses crt;

var n,i: integer;

begin clrscr;

readln(n);

for i:=1 to n do if(i mod 2 = 0) then write(i:3);

readln;

end.

1.

program InDaySoTuNhien;
var n, i: integer;
begin
   write('Nhap so nguyen duong n: ');
   readln(n);

   writeln('Day so tu 1 den ', n, ' la:');
   for i := 1 to n do
      write(i, ' ');
end.

2.

program InSoChan;
var
   n, i: integer;
begin
   write('Nhap so nguyen n: ');
   readln(n);

   writeln('Cac so nguyen chan trong khoang tu 1 den ', n, ' la:');
   for i := 1 to n do
   begin
      if i mod 2 = 0 then
         write(i, ' ');
   end;
end.