I'm not sure what is the point of eliminating 'ifs'? At any rate they can be easily replaced by e.g. 'while' loops, so in my opinion you should either eliminate both of them or none.
Again, the best way to generate such a sequence is using depth-first search or recursion. By prohibiting the usage of IFs, all solutions are inefficient (because we can't cut the tree, and are forced to follow all branches).
Numbers with prime factors 2, 3 and 5.
Back to basics 19 - character types
Find the maximum number of decimal places in a set of numbers
Celsius to Kelvin
Area of an equilateral triangle
Make an anonymous function that has variable output
Return fibonacci sequence do not use loop and condition
Successive zeros (harder)
Seperate array to small section according to its index position
Determine if input is a Narcissistic number
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