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What number comes next?

Look at the series (17, 51, 204, 1020, 6120, ?), determine the pattern, and find the value of the next number!

Correct answers: 130

The first user who solved this task is Rasoul Jafari.

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On Your Marks

Two n*dists were discussing politics.
One says, “Have you read Marx?”
The other nods, “It’s these blasted wicker chairs."

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First Black-American patent

In 1821, the first U.S. patent issued to a Black-American was granted to Thomas Jennings for a “dry-scouring”cleaning process (3 Mar 1821 No. X3306). Jennings used his royalties to buy his family out of slavery and to support the abolition of slavery. In 1831, Thomas Jennings became assistant secretary for the First Annual Convention of the People of Color in Philadelphia, Pennsylvania. For some time Henry Blair had been regarded as the first Black-American receiving a patent, for a corn planter (14 Oct 1834, No. X8447), until it became better known that the Jennings held that distinction.

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