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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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Robert Hoe

Born 29 Oct 1784; died 4 Jan 1833 at age 48.English-American printing-press manufacturer. The Smith brothers established a carpenter shop in New York City with Hoe's assistance under the firm name of Smith, Hoe & Company, specializing in wooden hand presses. Later, they made cast-iron frame presses with the toggle-joint principle instead of the screw for pressure. After the Smiths died, Hoe continued the business under the name of R. Hoe & Company (1823-33). He purchased (1827) Samuel Rust's patent for a wrought-iron framed printing press, made improvements and successfully manufactured it as the "Washington" press. His son Richard continued the business after his death and developed the rotary press which increased newspaper production.

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