**Let sequences X and Y consist of the least positive integers such that 2X+Y is the complement of X and X+Y is the complement of Y, starting with X(1)=1 and Y(1)=1; then this sequence equals X, while 2X+Y=A141205, Y=A141206 and X+Y=A141207.**

*1, 2, 4, 5, 6, 8, 9, 10, 11, 13, 14, 15, 17, 18, 20, 21, 22, 23, 24, 26, 27, 29, 30, 31, 33*

*3 seqfan posts*

Index of A-numbers in seqfan: by ascending order by month by frequency by keyword

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