Write a function that concatenates whole numbers.
numcat(111,222) should return 111222
numcat(1,2,3,4,5) should return 12345
Return the first and last character of a string
subtract central cross
Find nth maximum
Find maximum value of a curve
Factorions: Numbers that equal the sum of the factorials of their digits
Filter British English into American English
Dudeney Numbers: Numbers which are the cube of their decimal sum
Find the first N zeros of the 666 function
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