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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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Gunpowder mill

In 1639, the first record of the establishment of a gunpowder mill in the American colonies was an order from the General Court of Massachusetts granting 500 acres of land at Pecoit, Mass. Edward Rawson received the grant, “so as he goes on with the powder if the saltpeter comes.” Since Jamestown was settled (1607) and the Pilgrims landed at Plymouth (1620), firearms and gunpowder were brought from England—an uncertain supply. When the colonialists turned to producing gunpowder for themselves, the General Court encouraged homespun production efforts, especially for the saltpeter ingredient. The first gunpowder mill of importance was established in 1675 at Milton, Mass., on the Neponset River.«

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