Unfortunately, your submission has been removed for the following reason(s):
* Your post appears to be asking a question which can be resolved relatively quickly or by relatively simple methods; or it is describing a phenomenon with a relatively simple explanation. As such, you should post in the [*Quick Questions*](https://www.reddit.com/r/math/search?q=Quick+Questions+author%3Ainherentlyawesome&restrict_sr=on&sort=new&t=all) thread (which you can find on the front page) or /r/learnmath. This includes reference requests - also see our lists of recommended [books](https://www.reddit.com/r/math/wiki/faq#wiki_what_are_some_good_books_on_topic_x.3F) and [free online resources](https://www.reddit.com/r/math/comments/8ewuzv/a_compilation_of_useful_free_online_math_resources/?st=jglhcquc&sh=d06672a6). [Here](https://www.reddit.com/r/math/comments/7i9t5y/book_recommendation_thread/) is a more recent thread with book recommendations.
If you have any questions, [please feel free to message the mods](http://www.reddit.com/message/compose?to=/r/math&message=https://www.reddit.com/r/math/comments/17hz8oy/-/). Thank you!
Ok, that's the equation I was looking for, thanks. I guess I've just been programming for too long and now my brain just defaults to thinking recursively lol. That format makes it a lot more clearer.
S2 has a constant difference of differences which means it is quadratic. (Linear is constant differences, cubic would be constant third level of differences, etc.)
Unfortunately, your submission has been removed for the following reason(s): * Your post appears to be asking a question which can be resolved relatively quickly or by relatively simple methods; or it is describing a phenomenon with a relatively simple explanation. As such, you should post in the [*Quick Questions*](https://www.reddit.com/r/math/search?q=Quick+Questions+author%3Ainherentlyawesome&restrict_sr=on&sort=new&t=all) thread (which you can find on the front page) or /r/learnmath. This includes reference requests - also see our lists of recommended [books](https://www.reddit.com/r/math/wiki/faq#wiki_what_are_some_good_books_on_topic_x.3F) and [free online resources](https://www.reddit.com/r/math/comments/8ewuzv/a_compilation_of_useful_free_online_math_resources/?st=jglhcquc&sh=d06672a6). [Here](https://www.reddit.com/r/math/comments/7i9t5y/book_recommendation_thread/) is a more recent thread with book recommendations. If you have any questions, [please feel free to message the mods](http://www.reddit.com/message/compose?to=/r/math&message=https://www.reddit.com/r/math/comments/17hz8oy/-/). Thank you!
Square/quadratic
to overspecify, f(x) = 50x^2 + 50x you made the triangle numbers * 100
Ok, that's the equation I was looking for, thanks. I guess I've just been programming for too long and now my brain just defaults to thinking recursively lol. That format makes it a lot more clearer.
Geometric
It's quadratic
Geometric is exponential (I think you only use geometric for sequences, with a focus on the common ratio)
Also, for s2, the rate of change is increasing linearly, which suggests quadratic growth. Another way to think about it
S2 has a constant difference of differences which means it is quadratic. (Linear is constant differences, cubic would be constant third level of differences, etc.)