Write a function that concatenates whole numbers.
numcat(111,222) should return 111222
numcat(1,2,3,4,5) should return 12345
Sums with Excluded Digits
Number of 1s in a binary string
Find number of days
Output any real number that is neither positive nor negative
Dudeney Numbers: Numbers which are the cube of their decimal sum
Find the first N zeros of the 666 function
Distance between two GPS Coordinates
Airline Ticket Mod7 Checksum
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