Programmer 
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S A B C D Program 2, 4, 8, 16, 32, 64, … 20 numbers are perfect O is useful too 10, 20, 30, 40, … Tens are great and easy to work with 6, 18, 24, 38, 42, … Numbers divisible by two are pretty 3, 1, 9, 849, 33, Eh.. you can’t divise them by 2 without getting float. But they are needed 4.394, 28.9494, Needed for smooth movement but I dont like em