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 A053169 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. 2
 4, 7, 9, 11, 12, 13, 15, 17, 18, 20, 21, 22, 23, 24, 25, 28, 29, 30, 31, 32, 33, 34, 35, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 53, 54, 55, 56, 57, 58, 60, 61, 63, 64, 65, 66, 67, 68, 70, 71, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS "Not in sequence A_n" means not in the full list of terms, not simply in the list of terms visible in the entry. The paradox is of course: is 53169 in this sequence? REFERENCES 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. LINKS EXAMPLE Sequence A000001 contains 1, so 1 is not in the sequence; A000002 contains 2, so 2 is not in the sequence; ... CROSSREFS Cf. A037181. Complement of A053873. Sequence in context: A310941 A310942 A273916 * A007656 A159619 A272454 Adjacent sequences:  A053166 A053167 A053168 * A053170 A053171 A053172 KEYWORD nonn,nice AUTHOR Miklos Szabo (mike(AT)ludens.elte.hu), N. J. A. Sloane, Feb 29 2000 EXTENSIONS Thanks to Alexander Hulpke (ahulpke(AT)math.ohio-state.edu) for the information that 19 is in A000019. Extended to n=100 by N. J. A. Sloane, May 26 2007 STATUS approved

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Last modified October 17 06:08 EDT 2019. Contains 328106 sequences. (Running on oeis4.)