Código PHP:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html><head>
<meta content="text/html; charset=ISO-8859-1" http-equiv="content-type">
<title>bingo</title>
</head><body>
Bingo<br>
insertar 2 digitos del 0 al 20 <br />
<form method="post" action="result.php">
<?php for($i=0;$i<6;$i++)
{
echo "<input type=text name=numero_$i>" ."<br>";
}
?>
<input type="submit" value="enviar">
</form>
<br>
<br>
</body></html>