You may be aware that the sum of the numbers which are not divisible by 2 is a square number. |
The sum of all odd numbers is either unbounded (if only including the positives) or undefined (if including all integers).
EDIT: Ah, I see what you mean, now. Finite sums of consecutive odd integers are square numbers.
It may also be in your knowledge that, the sum of the hex numbers is a cube number |
This sentence is meaningless.
forming equilateral triangles on the sides of a scalene triangle, and then joining the midpoints of these equilateral triangles |
Weird, but seemingly true!
when pondering further into them, you may realise that what initially comes across as intrinsic beauty, is merely the result of intentional manipulation. |
No, there's no such thing as "intrinsic beauty". Beauty is exclusively extrinsic. It's interpreted in the mind of a conscious agent when it perceives something. There's nothing about the number 2 that's objectively more or less beautiful than the number 39.07. You could define a function that quantifies the beauty of numbers, but then that would still be extrinsic to the numbers themselves. All that's happening is that humans enjoy unexpected simplicity, happy coincidences, and neatness. That's essentially what the concept of "mathematical elegance" boils down to.
However, I don't think it's accurate to say that beauty in this sense is the result of intentional manipulation. Sometimes you can define a system with specific rules, and those rules can have consequences you did not foresee, some of which will be aesthetically pleasing.
For example, one time I was playing around with a tree drawing program I'd written, and out of the blue I thought "what if I construct the tree like this?"
1. If the current branch has length 1, its two children should have length 1/sqrt(2).
2. A branch's children are always orthogonal to their parent, and parallel and opposite to each other.
I had no idea what the tree was going to look like, but I was pleasantly surprised when it turned out to look like this:
https://upload.wikimedia.org/wikipedia/commons/a/af/H_tree.svg
An H tree has the property that as more levels are added, the branches approach their ancestors arbitrarily close. This is what's known as a space-filling curve.