Write a function that concatenates whole numbers.
numcat(111,222) should return 111222
numcat(1,2,3,4,5) should return 12345
Return the Fibonacci Sequence
Create a Multiplication table matrix...
Number of digits in an integer
Replace odd number in given matrix by zero
Airline Ticket Mod7 Checksum
Dudeney Numbers: Numbers which are the cube of their decimal sum
What is the nth step in Conway's Life?
Factorions: Numbers that equal the sum of the factorials of their digits
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