Could you give me any other math question?

Question

Sometimes in the SoloLearn Q/A I found some interesting questions about numbers..
Someone asked for prime numbers, or a prime factorized algorithm, other persons asked for Fibonacci Numbers and so on.. Recently I found a question about number conversion in any base.. But there is a lot of time I don't find something exciting..
So I ask to you if you have some other nice and interesting mathematics argument to give me and to treat together.
Thank you for your answer or thank you if you like math!

Answer 1

Hi, @Mario! Thank you for your answer: I've found https://projecteuler.net
In the next days I will analising this progect and I will do some practice.. ;)

Answer 2

Hi, @Megatron! Thank you for answer.. I think Ramanujan numbers are very interesting and a bit more complex than other algorithms i did.. Sorry but matrix for me are a little boring..

Answer 3

hardy Ramanujan number
a number that can be expressed as a sum of cubes of two numbers in two different ways.
first hardy Ramanujan number is 1729.
1³+12³=1729
10³+9³=1729
A program to tell if a number is hardy Ramanujan number or not.

Answer 4

if you like math, try project euler ;)

Answer 5

sum the diagonal elements of a n*n matrix.

Answer 6

Well actual yes matrix are easy but I was thinking if you can do it in the shortest possible way.

Answer 7

Can you print number
[123]
|894|
[765]n*n matrix