%N 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.
%C "Not in sequence A_n" means not in the full list of terms, not simply in the list of terms visible in the entry.
%C The paradox is of course: is 53169 in this sequence?
%C Is 53873 in this sequence? - _Tanya Khovanova_, Aug 09 2007
%D Smullyan, Raymond M, What is the name of this book? : The riddle of Dracula and other logical puzzles, Englewood Cliffs, NJ : Prentice-Hall, c1978, see puzzle 163.
%e Sequence A000001 contains 1, so 1 is not in the sequence; A000002 contains 2, so 2 is not in the sequence; ...
%Y Cf. A037181.
%Y Complement of A053873.
%A Miklos Szabo (mike(AT)ludens.elte.hu), _N. J. A. Sloane_, Tue Feb 29 2000
%E Thanks to Alexander Hulpke (ahulpke(AT)math.ohio-state.edu) for the information that 19 is in A000019.
%E Extended to n=100 by _N. J. A. Sloane_, May 26 2007