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101010 - I'm guessing you know, and want to find out how long it takes for someone to notice and respond.

little endian vs big endian.

Also, typing it out while you run the algo in your head: 42 even -> 0, 21 odd -> 1, 10 even -> 0, 5 odd -> 1, 2 even -> 0, 1 odd -> 1.

ah, I never actually bothered to read up on binary notation. I only know it via party tricks (counting to a thousand on two hands)