Assignment

Write a function number2pattern two integer $$i$$ and $$k$$. The function must return the string at index $$i$$ among all lexicographically ordered DNA k-mers.

Example

        >>> number2pattern(45, 4)
'AGTC'
>>> number2pattern(5353, 7)
'CCATGGC'
>>> number2pattern(8799, 8)
'AGAGCCTT'