Write a function that concatenates whole numbers.
numcat(111,222) should return 111222
numcat(1,2,3,4,5) should return 12345
Test for balanced parentheses
Add two numbers
Find out value of sine given by degree.
Sum of series I
Dudeney Numbers: Numbers which are the cube of their decimal sum
Filter British English into American English
Factorions: Numbers that equal the sum of the factorials of their digits
Find the first N zeros of the 666 function
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