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Find the next number in the ...

Find the next number in the sequence 517, 1251343, 181251276427, ...

Correct answers: 37

The first user who solved this task is H Tav.

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Black American patent

In 1874, a U.S. patent for a "Steam Lubricator" was issued to the prolific Black American inventor, Elijah J. McCoy (No. 146,697).

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