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February 19, 2017 22:24
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Compute Sqrt, Decimal Digit at a Time, As List.
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| w x r=d:w(100*(x-20*r*d-d*d))(10*r+d) | |
| where d=head(filter(\d -> 20*r*d+d*d>=x)[0..])-1 | |
| sqrt_digits n = w n 0 |
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