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Calculate A+B+C+D

Look at the series (10, C, B, 59, A, 227, 451, 899, 1795, 3587, D, 14339, ...), determine the pattern, and find the unknown values (A, B, C and D) and calculate A+B+C+D!

Correct answers: 42

The first user who solved this task is Nasrin 24 T.

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Answering Machine Message 192

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Black American patent

In 1897, a U.S. patent for an improvement in "Casting Composite or Other Wheels" was issued to black American inventor E.R. Robinson (No. 594,286). It gave a method for casting wheels wherein the outer sides are of one metal and the interior portions are of another metal. The importance was not only to enable casting a metal of high electrical conductivity, such as brass, in a groove of an iron trolley wheel - but also to permit an entirely new contruction consisting of two outer disks or flanges and an intermediate, uniting portion, which extends from the contact portion of the wheel with a web extending to the centre and an integral bushing. Robinson also held a previous patent, issued four years earlier, for an "electric railway trolley."[Image: plan view of bottom section of a wheel three-part mold]

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