Figuring The Joy Of NumbersShakuntala Devi
Figuring The Joy Of Numbers
by Shakuntala Devi · first published 1993
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> In Devi’s case, we don’t know what techniques she used for this demonstration. Why? Because she never told people. Yes we do. Yes she did. Devi published a book in 1977, entitled Figuring: The Joy of Numbers. "Cubes and Cube Roots" is chapter 9. All of the stuff that Peter S. Magnusson claims that Devi never told people about taking the cube root of an 8-digit number is right there in Devi's 1977 book,…
on “Shakuntala Devi – The Human Computer (2016)” ↗…particularly difficult algorithm. It's just modulo 7 arithmetic and some divisions combined with a table lookup. Martin Gardner of course covered it. I first encountered it in Shakuntala Devi's book Figuring: The Joy of Numbers, which has a slightly different lookup table. With practice, one can run it as the date is being given, a common lightning calculator trick for making things faster, and the lookup table becomes directly…
on “John Conway has died” ↗> Figuring: The Joy of Numbers Archive.org (link to the chapter): https://archive.org/details/B-001-014-505/page/n81/mode/2up
on “Shakuntala Devi – The Human Computer (2016)” ↗