Titius-Bode Law

Physical Law
The Titius-Bode law is the observation that the semi-major axes of successive planets of the solar system are governed by the equation:
 * $a = 4 + \left\lfloor{2^{n-1} }\right\rfloor \times 3$

where:
 * $a$ is the measure of distance such that the Earth's semi-major axes is defined as $10$
 * $n = 0, 1, 2, \ldots$ for successive planets
 * $\left\lfloor{2^{n-1} }\right\rfloor$ denotes the floor of $2^{n-1}$.

That is, $a$ is defined by the sequence:
 * $4, 7, 10, 16, 28, 52, 100, 196, \ldots$

While accurate for the planets out as far as Uranus, the law breaks down for Neptune and beyond.

Also known as
The Titius-Bode Law is also seen named as Bode's Law.