**A paradoxical sequence: a positive integer n is in this sequence if and only if n is not in sequence A_n in the database.**

*4, 7, 9, 11, 12, 13, 15, 17, 18, 20, 21, 22, 23, 24, 25, 28, 29, 30, 31, 32, 33, 34, 35, 38*

*2 seqfan posts*

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

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