Tags » Primes

A fun project on the Arecibo Message inspired by a Holly Krieger Tweet

Saw this neat Tweet from Holly Krieger earlier today:

sharing the weirdest real-life use of factorization I know: the Arecibo message. Nice description here:https://t.co/EZRrOLn3lT…

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Prime subset sums

Efrat Bank‘s interesting number theory seminar here before break was about sums of arithmetic functions on short intervals in function fields.  As I was saying… 370 more words

Math

15-square puzzle

From the category “This Is Completely Useless”: here’s what a 15-square puzzle looks like when you arrange the tiles in order of how many factors they have.

Elementary

The Möbius function proof, part 2 (the subset parity lemma)

Continuing from my previous post, we are in the middle of proving that satisfies the same equation as , that is,

and that therefore for all , that is, is the sum of all the th primitive roots of unity. 1,033 more words

Proof

Number Spirals Part 2

Recall in part one I mentioned the root spiral and prime numbers. I won’t go into the history of how they came about (other than mention that Mr. 396 more words

Sharing Kelsey Houston-Edwards's philosophy of math video with kids

Kelsey Houston-Edwards is making a series of math videos and the first two are outstanding. We looked at the first one last week:

Sharing Kelsey Houston-Edward’s video with kids… 114 more words

What I Learned by Reading "Gamma: Exploring Euler's Constant" by Julian Havil: Index

I’m doing something that I should have done a long time ago: collecting a series of posts into one single post.

When I was researching for my… 311 more words

Precalculus