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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. 3
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. A107357.
Complement of A053873.
Sequence in context: A310941 A310942 A273916 * A007656 A159619 A272454
KEYWORD
nonn,nice
AUTHOR
Miklos Szabo (mike(AT)ludens.elte.hu), N. J. A. Sloane, Feb 29 2000
EXTENSIONS
Thanks to Alexander Hulpke 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 March 28 10:55 EDT 2024. Contains 371241 sequences. (Running on oeis4.)