Calculate axb
Look at the series (13, 41, a, 377, b, 3401, ...), determine the pattern, and calculate axb.Correct answers: 31
The first user who solved this task is Manguexa Wagle.
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BellowsIn 1834, the first U.S. patent for bellows was issued to J.R. Morrison of Springfield, Ohio (no patent number was assigned on patents of this time). The bellows were designed for smiths and furnace fires.* |