Write a function that concatenates whole numbers.
numcat(111,222) should return 111222
numcat(1,2,3,4,5) should return 12345
Find all elements less than 0 or greater than 10 and replace them with NaN
surface of a spherical planet
Number of Circles in a Number
multiply by three
Factorions: Numbers that equal the sum of the factorials of their digits
Airline Ticket Mod7 Checksum
Whole Number Un-Concatenator
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