What is the sum of the first fifteen counting numbers?
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1,2,3,4,5,6,7,8,10,11,12,13,14,15,16
1,10,11,100,101,110,111,1000,1001,1010,1011,1100,1101,1110,1111
1, 2, 3, 4, 5, 6, 10, 11, 12, 13, 14, 15, 16, 20, 21...
1, 2, 10, 11, 12, 20, 21, 22, 100, 101, 102, 110, 111, 112, 120
1, 2, 3 10, 11, 12, 13 20, 21, 22, 23 30, 31, 32, 33,