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It is either O or E (Posted on 2018-09-12) Difficulty: 2 of 5
Where odious is the opposite of evil?

No Solution Yet Submitted by Ady TZIDON    
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Solution complete answer (spoiler) | Comment 1 of 5

An odious number is a nonnegative number that has an odd number of 1s in its binary expansion. The first few odious numbers are therefore 1, 2, 4, 7, 8, 11, 13, 14, 16, 19, ... (OEIS A000069). Numbers that are not odious are said to be evil numbers.

http://mathworld.wolfram.com/OdiousNumber.html


  Posted by broll on 2018-09-12 09:01:31
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