Each number is the decimal value for the sequence of palindromic binary numbers, starting with (and finishing with) a 1. ie. 1=1, 3=11, 5=101, 7=111, 9=1001, 15=1111, 17=10001, 21=10101, 27=11011, 31=11111, 33=100001, 45=101101.
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