Write a function that concatenates whole numbers.
numcat(111,222) should return 111222
numcat(1,2,3,4,5) should return 12345
Determine if input is odd
Distance walked 2D
Make one big string out of two smaller strings
Flip the main diagonal of a matrix
Factorions: Numbers that equal the sum of the factorials of their digits
Dudeney Numbers: Numbers which are the cube of their decimal sum
Whole Number Un-Concatenator
What is the nth step in Conway's Life?
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