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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A073786 Numbers in base -5. 10
0, 1, 2, 3, 4, 140, 141, 142, 143, 144, 130, 131, 132, 133, 134, 120, 121, 122, 123, 124, 110, 111, 112, 113, 114, 100, 101, 102, 103, 104, 240, 241, 242, 243, 244, 230, 231, 232, 233, 234, 220, 221, 222, 223, 224, 210, 211, 212, 213, 214, 200, 201, 202, 203 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

REFERENCES

D. E. Knuth, The Art of Computer Programming. Addison-Wesley, Reading, MA, 1969, Vol. 2, p. 189.

LINKS

Chai Wah Wu, Table of n, a(n) for n = 0..10000

Eric Weisstein's World of Mathematics, Negabinary

Prepared and presented by Matthew Szudzik of Wolfram Research, A Mathematica programming contest

MATHEMATICA

ToNegaBases[i_Integer, b_Integer] := FromDigits[ Rest[ Reverse[ Mod[ NestWhileList[(#1 - Mod[ #1, b])/-b &, i, #1 != 0 &], b]]]]; Table[ ToNegaBases[n, 5], {n, 0, 55}]

PROG

(Python)

def A073786(n):

    s, q = '', n

    while q >= 5 or q < 0:

        q, r = divmod(q, -5)

        if r < 0:

            q += 1

            r += 5

        s += str(r)

    return int(str(q)+s[::-1]) # Chai Wah Wu, Apr 09 2016

CROSSREFS

Cf. A007091, A039724, A073785, A007608, A073787, A073788, A073789, A073790 & A039723.

Sequence in context: A001095 A004866 A062930 * A127280 A229622 A244552

Adjacent sequences:  A073783 A073784 A073785 * A073787 A073788 A073789

KEYWORD

base,easy,nonn

AUTHOR

Robert G. Wilson v, Aug 11 2002

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 February 24 17:22 EST 2018. Contains 299624 sequences. (Running on oeis4.)