MathPHP\Sequence\Basic::geometricProgression PHP Метод

    public static function geometricProgression(int $n, $a, $r) : array
    {
        if ($r === 0) {
            throw new Exception\BadParameterException('Common ratio r cannot be 0');
        }
        $progression = [];
        if ($n < 0) {
            return $progression;
        }
        for ($i = 0; $i < $n; $i++) {
            $progression[] = $a * $r ** $i;
        }
        return $progression;
    }