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A073790 Numbers in base -9. 10
0, 1, 2, 3, 4, 5, 6, 7, 8, 180, 181, 182, 183, 184, 185, 186, 187, 188, 170, 171, 172, 173, 174, 175, 176, 177, 178, 160, 161, 162, 163, 164, 165, 166, 167, 168, 150, 151, 152, 153, 154, 155, 156, 157, 158, 140, 141, 142, 143, 144, 145, 146, 147, 148, 130, 131 (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[(# - Mod[ #, b])/-b &, i, # != 0 &], b]; Table[ ToNegaBases[n, 9], {n, 0, 60}]

PROG

(Python)

def A073790(n):

    s, q = '', n

    while q >= 9 or q < 0:

        q, r = divmod(q, -9)

        if r < 0:

            q += 1

            r += 9

        s += str(r)

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

CROSSREFS

Cf. A007095, A039724, A073785, A007608, A073786, A073787, A073788, A073789 & A039723.

Sequence in context: A004870 A037336 A037443 * A029965 A004881 A004892

Adjacent sequences:  A073787 A073788 A073789 * A073791 A073792 A073793

KEYWORD

base,easy,nonn

AUTHOR

Robert G. Wilson v, Aug 11 2002

STATUS

approved

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Last modified December 11 06:55 EST 2016. Contains 279043 sequences.