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bumbledraven
on Jan 4, 2018
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Techniques for Factoring Numbers in Your Head
Doerfler's _ Dead Reckoning: Calculating Without Instruments _ (pages 47-73) deals extensively with this issue.
https://archive.org/stream/deadreckoningcal00doer#page/46/mo...
dahart
on Jan 4, 2018
[–]
Picked up a copy of that book a few years ago, I think because of a comment I read here on HN. It is fantastic for learning various mental and pencil/paper techniques. Having read it helped me out with a few problems on Project Euler.
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