Shakuntala Devi, an Indian mental calculator,was asked to give the 23rd root of a 201-digit number; she answered in 50 seconds. Her answer was confirmed by calculations done at the US Bureau of Standards for which a special program had to be written to perform such a large calculation. On 18 June 1980, she demonstrated the multiplication of two 13-digit numbers—7,686,369,774,870 × 2,465,099,745,779—picked at random by the Computer Department of Imperial College, London. She correctly answered in 28 seconds. This event is mentioned in the 1982 Guinness Book of Records. Writer Steven Smith states that the result is so far superior to anything previously reported that it can only be described as unbelievable.
Posted on: Fri, 23 Jan 2015 07:13:44 +0000
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