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Search: id:A053169
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| A053169 |
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A paradoxical sequence: n is in this sequence if and only if n is not in sequence A_n in the database. |
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+0
2
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| 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; listen)
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OFFSET
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1,1
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COMMENT
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"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?
Is 53873 in this sequence? - Tanya Khovanova (tanyakh(AT)yahoo.com), Aug 09 2007
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REFERENCES
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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.
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EXAMPLE
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Sequence A000001 contains 1, so 1 is not in the sequence; A000002 contains 2, so 2 is not in the sequence; ...
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CROSSREFS
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Cf. A037181.
Complement of A053873.
Sequence in context: A055047 A153001 A010454 this_sequence A007656 A159619 A131827
Adjacent sequences: A053166 A053167 A053168 this_sequence A053170 A053171 A053172
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KEYWORD
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nonn,nice
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AUTHOR
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Miklos Szabo (mike(AT)ludens.elte.hu), N. J. A. Sloane (njas(AT)research.att.com), Tue Feb 29 2000
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EXTENSIONS
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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 (njas(AT)research.att.com), May 26 2007
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