login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A003100 Decimal Gray code for n.
(Formerly M0486)
10
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 79, 78, 77 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

This permutation of the nonnegative integers is not self-inverse, as previously claimed. The first exception is a(100) = 190, but a(190) = 109. - Franklin T. Adams-Watters, Mar 05 2010

a(n) = A118757(n) for n<=100, = a(100)=A118757(100)=190, but a(101)=191, A118757(101)=180. - Reinhard Zumkeller, May 01 2006

REFERENCES

M. Gardner, Knotted Doughnuts and Other Mathematical Entertainments. Freeman, NY, 1986, p. 18.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Franklin T. Adams-Watters, Table of n, a(n) for n = 0..10000

A. J. Cole, Cyclic progressive number systems, Math. Gaz., 50 (1966), 122-131.

A. J. Cole, Cyclic progressive number systems, Math. Gaz., 50 (1966), 122-131. [Annotated scanned copy]

Henry W. Gould, Letters to N. J. A. Sloane, Oct 1973 and Jan 1974.

D. E. Knuth, Gray Codes (Vol. 4 of TAOCP)

Index entries for sequences that are permutations of the natural numbers

MAPLE

A003100 :=proc(n)

    local s, i:

    s:=[op(convert(n, base, 10)), 0]:

    add(piecewise(s[i+1] mod 2=0, s[i], 9-s[i])*10^(i-1), i=1..nops(s)-1) :

end proc:

seq(A003100(j), j=0..100); # Pab Ter, Oct 14 2005

CROSSREFS

Inverse is A174025.

Sequence in context: * A118757 A118758 A174025 A106649 A284030 A087121

Adjacent sequences:  A003097 A003098 A003099 * A003101 A003102 A003103

KEYWORD

nonn,base,easy,look

AUTHOR

N. J. A. Sloane, Henry W. Gould

EXTENSIONS

More terms from Pab Ter (pabrlos2(AT)yahoo.com), Oct 14 2005

Incorrect comment replaced by Franklin T. Adams-Watters, Mar 05 2010

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified November 22 15:27 EST 2017. Contains 295089 sequences.