There are a few questions on this site about balancing brackets, and checking whether brackets are balanced. I propose it's now time to use those balanced brackets for something!
In mathematics and ...
Four integer sequences
In this challenge, you will test four different properties of a positive integer, given by the following sequences.
A positive integer N is
perfect (OEIS A000396), if the sum ...
Mathematicians are interested in all kinds of algebraic structures, e.g. groups, rings, boolean algebras. Generally, we have several operations (addition, multiplication, meet, join, etc.), ...
A 2D array containing two distinct (optional) values.
I'll use 0 and 1 when explaining the rules. The input format is of course flexible.
Zeros are water, and ones are islands. In ...
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