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A057891 In base 2, neither a palindrome nor becomes a palindrome if trailing 0's are omitted. 6
11, 13, 19, 22, 23, 25, 26, 29, 35, 37, 38, 39, 41, 43, 44, 46, 47, 49, 50, 52, 53, 55, 57, 58, 59, 61, 67, 69, 70, 71, 74, 75, 76, 77, 78, 79, 81, 82, 83, 86, 87, 88, 89, 91, 92, 94, 95, 97, 98, 100, 101, 103, 104, 105, 106, 109, 110, 111, 113, 114, 115, 116, 117, 118 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

These could be called "asymmetric bit strings".

Fixed pairs of A057889, complement of A057890

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

FORMULA

A030101(A030101(n)) != A030101(n). - David Wilson, Jun 09 2009, Jun 18 2009

A178225(A000265(a(n))) = 0. [Reinhard Zumkeller, Oct 21 2011]

EXAMPLE

11 is included because 1011 is asymmetrical, but 12 is not because 001100 is a palindrome.

PROG

(Haskell)

a057891 n = a057891_list !! (n-1)

a057891_list = filter ((== 0) . a178225 . a000265) [1..]

-- Reinhard Zumkeller, Oct 21 2011

CROSSREFS

Cf. A061917, A006995. Complement of A057890.

Cf. A030101, A000265, A006519, A057889.

Sequence in context: A005360 A269806 A062019 * A164708 A030792 A101934

Adjacent sequences:  A057888 A057889 A057890 * A057892 A057893 A057894

KEYWORD

easy,nonn,base

AUTHOR

Marc LeBrun, Sep 25 2000

EXTENSIONS

Edited by N. J. A. Sloane, Jun 09 2009 at the suggestion of Ray Chandler.

A-numbers in formula corrected by R. J. Mathar, Jun 18 2009

STATUS

approved

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Last modified September 26 10:31 EDT 2017. Contains 292518 sequences.