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A073788 Numbers in base -7. 11
0, 1, 2, 3, 4, 5, 6, 160, 161, 162, 163, 164, 165, 166, 150, 151, 152, 153, 154, 155, 156, 140, 141, 142, 143, 144, 145, 146, 130, 131, 132, 133, 134, 135, 136, 120, 121, 122, 123, 124, 125, 126, 110, 111, 112, 113, 114, 115, 116, 100, 101, 102, 103, 104, 105 (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
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, 7], {n, 0, 60}]
PROG
(Python)
def A073788(n):
s, q = '', n
while q >= 7 or q < 0:
q, r = divmod(q, -7)
if r < 0:
q += 1
r += 7
s += str(r)
return int(str(q)+s[::-1]) # Chai Wah Wu, Apr 09 2016
CROSSREFS
Sequence in context: A100793 A099145 A004868 * A326315 A004879 A062943
KEYWORD
base,easy,nonn
AUTHOR
Robert G. Wilson v, Aug 11 2002
STATUS
approved

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Last modified March 19 06:56 EDT 2024. Contains 370953 sequences. (Running on oeis4.)