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There are four three-digit n...

There are four three-digit numbers that share this property: the number itself, its double and its triple contain each digit from 1 to 9 exactly once. For example, 192 is one of them because 192, 384, 576 contain 1 to 9 each once. 273 is another one of them because 273, 546, 819 contain 1 to 9 each once. Can you find the other two numbers and calculate the product of these two numbers?

Correct answers: 23

The first user who solved this task is Djordje Timotijevic.

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Why don't some coup...

“Why don't some couples go to the gym?
- Because some relationships don't work out.”

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British Orthopaedic Society

In 1894, the British Orthopaedic Society held its first general meeting at the Holborn Restaurant, London. Of the 31 members, 13 were local to London. Its formation was led by a group of seven surgeons including Sir Robert Jones who had met informally on 3 Aug 1894 and chose its name and chairman. It ceased to exist in 1900, perhaps because the members, being mostly general surgeons practicing only some orthopaedics, had too limited interest in the specialty. In 1918, Sir Robert Jones and several others surgeons again founded a professional organisation, the current British Orthopaedic Association. The American Orthopaedic Association was the first nationally affiliated group of orthopaedic surgeons (1887)*«[Image: Sir Robert Jones.]

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