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MATH PUZZLE: Can you replace...

MATH PUZZLE: Can you replace the question mark with a number?

Correct answers: 397

The first user who solved this task is Sanja Šabović.

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The Forgotten Name

Two old friends met by chance on the street.
After chatting for some time one said to the other, "I'm terribly sorry, but I've forgotten your name. You'll need to tell me".
The other stared at him thoughtfully for a long time, then replied, "How soon do you need to know?"

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Johann Daniel Titius

Born 2 Jan 1729; died 16 Dec 1796 at age 67.Prussian astronomer, physicist, and biologist whose formula (1766) expressing the distances between the planets and the Sun was confirmed by J.E. Bode in 1772, when it was called Bode's Law. Titius suggested that the mean distances of the planets from the sun very nearly fit a simple relationship of A=4+(3x2n) giving the series 4, 7, 10, 16, 28*, 52, 100, corresponding to the relative distance of the six known planets, up to Saturn, and an unassigned value (*) between Mars and Jupiter. Olbers searched for a planetary object at this empty position, thus discovering the asteroid belt. However, since the discovery of Neptune, which did not fit the pattern, the "law" is regarded as a coincidence with no scientific significance.[DSB gives date of death 16 Dec 1796. EB gives 11 Dec 1796.]

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