New math post on my blog: More about the happy numeric coincidence https://blog.plover.com/math/power-digit-sum-2.html

I spent some time today thinking about how long it would take me to produce a table of sines and cosines by hand. Of course it depends on the density and the precision of the table, but my conclusion was that it wouldn't take excessively long. I'd start by calculating sin 1° using the Maclaurin series, then use angle addition formulas to work up to 2°, 4°, , etc, to 90°.

New math post on my blog: A happy numeric coincidence https://blog.plover.com/math/power-digit-sum.html

Are there any numbers larger than 9 that are equal to the product of their base-10 digits? No. Well, maybe, if you are willing to allow sixty-twelve and six hundred sixteenty-eight … https://math.stackexchange.com/questions/3053621/numbers-such-that-they-equal-the-product-of-their-own-digits/3053696#3053696

New math post on my blog: Necklaces and bracelets https://blog.plover.com/math/necklaces-and-bracelets.html

New math post on my blog: How many kinds of polygonal loops? (part 2) https://blog.plover.com/math/polygonal-loops-2.html

New math post on my blog: How many kinds of polygonal loops? https://blog.plover.com/math/polygonal-loops.html

@carbontwelve Please add me to Mathematics. #Trunk

- Good blog
- https://blog.plover.com/

- Crappy blog
- https://shitpost.plover.com/

- Totemic animal spirit
- Octopus

I am an amateur mathematician, but not the angle-trisecting kind.

Joined May 2017