Return true if the input is a Smith number in base ten. Otherwise, return false. Read about Smith numbers at http://en.wikipedia.org/wiki/Smith_number.
A Smith number must be positive and have more than one factor.
Return a list sorted by number of occurrences
select the primes of a vector
Length of the hypotenuse
Remove TeX from string
Get input and output variable names
Test within tolerance
Split up vector or matrix delimited by NaNs
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