Shakuntala Devi (November 4, 1929 – April 21, 2013) was an Indian writer and mental calculator, popularly known as the "human computer". A child prodigy, her talents eventually earned her a place in the 1982 edition of The Guinness Book of World Records.
In 1977 in Dallas she competed with a computer to see who give the cube root of 188138517 faster, she won. At an American university she was asked to give the 23rd root of 91674867692003915809866092758538016248310668014430862240712651642793465704086709659 3279205767480806790022783016354924852380335745316935111903596577547340075681688305 620821016129132845564805780158806771.
She answered in 50 seconds.
Her answer of 546372891 took a UNIVAC 1108 computer a full minute (10 seconds more) to confirm that she was right after it was fed with 13000 instructions.
On June 18, 1980, she demonstrated the multiplication of two 13-digit numbers 7,686,369,774,870 x 2,465,099,745,779 picked at random by the Computer Department of Imperial College, London. She correctly answered 18,947,668,177,995,426,462,773,730 in 28 seconds. This event is mentioned in the 1995 Guinness Book of Records.
She answered in 50 seconds.
Her answer of 546372891 took a UNIVAC 1108 computer a full minute (10 seconds more) to confirm that she was right after it was fed with 13000 instructions.
On June 18, 1980, she demonstrated the multiplication of two 13-digit numbers 7,686,369,774,870 x 2,465,099,745,779 picked at random by the Computer Department of Imperial College, London. She correctly answered 18,947,668,177,995,426,462,773,730 in 28 seconds. This event is mentioned in the 1995 Guinness Book of Records.
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