| public static triangularNumber ( integer $n ) : array | ||
| $n | integer | How many numbers in the sequence |
| Результат | array | Indexed from 1 |
public static function triangularNumber(int $n) : array
{
$triangular = [];
// Bad input; return empty list
if ($n <= 0) {
return $triangular;
}
// Standard case for pn: n(n + 1) / 2
for ($i = 1; $i <= $n; $i++) {
$triangular[$i] = $i * ($i + 1) / 2;
}
return $triangular;
}