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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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Crazy people don't know they are crazy

Crazy people don't know they are crazy, I know i'm crazy therefore i'm not crazy. Isn't that crazy.

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Thames Tunnel Opening

In 1843, the Thames Tunnel in London, the world's first tunnel under a navigable river, was opened for pedestrians between Rotherhithe and Wapping. Work had started on 2 Mar 1825. Excavation was engineered by Marc Brunel, for which he used a tunneling shield to reduce the danger of collapse while digging through soft sediments. Beginning his own engineering career, his son Isambad K. Brunel assisted. Together they persevered through 18 years, dealing with floods, human disasters, and delays caused by financing difficulties. Planned ramps for use by carts and freight traffic were never added due to cost. A railway line through the tunnel opened on 7 Dec 1869, and it remains in use as the oldest part of the London Underground.«

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