Igor

Igor Shelushkov

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Soviet mental calculator

Why Is Igor Shelushkov Influential?

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According to Wikipedia, Igor Alexeyevich Shelushkov was a Soviet mental calculator. He mentally extracted roots of large numbers and calculated the number of syllables and characters in a given verse by listening. Shelushkov was featured in the 1968 Soviet popular science film Seven Steps Beyond the Horizon, where he mentally extracted the sixth root of a 12-digit number and the 77th root of another multi-digit number. Shelushkov also competed with the Soviet third generation computer Mir. He extracted the 77th root of a 148-digit number in 18 seconds, while it took about 10 minutes to program the related operation for computer.

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