Nice expression for the usage test. Maybe one can add function "dec2base", cause the return type is a String.
The problem description should mention that dec2base isn't allowed either.
This will fail to detect certain palindromes which contain zero e.g. 10101 however the test suite doesn't (yet) contain any such.
There's something strange with the Cody test suites today...
Solve the set of simultaneous linear equations
Calculate the area of a triangle between three points
Add two numbers
Test if two numbers have the same digits
Try 1.5.4: Celsius to Fahrenheit
Next Higher Power of B
Solve the Sudoku Row
Number of 1s in the Binary Representation of a Number
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