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Calculate the number 4668

NUMBERMANIA: Calculate the number 4668 using numbers [8, 5, 1, 2, 66, 349] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 13

The first user who solved this task is Nílton Corrêa de Sousa.

#brainteasers #math #numbermania

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Invisible man

Nurse: "The invisible man is here for his appointment."
Doctor: "Tell him I'm sorry I can't see him right now."

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Stove patent

In 1793, Robert Haeterick of Pennsylvania was issued the first American patent for a stove design of cast iron. His name is spelled in various ways in the early records, including "Heterick." His patent was issued about three years after the very first U.S. patent, and like others of the period, it was not numbered. The original record of this patent was destroyed in the 1836 Patent Office fire. Most of the lost records were not reconstructed, and the full patents no longer exist in the Patent Office records. However, a list of titles and inventors was compiled from printed (usually annual) lists of patents which had been issued, and this list preserves some knowledge of the early patents.

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