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A007089
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Numbers in base 3.
(Formerly M1960)
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97
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0, 1, 2, 10, 11, 12, 20, 21, 22, 100, 101, 102, 110, 111, 112, 120, 121, 122, 200, 201, 202, 210, 211, 212, 220, 221, 222, 1000, 1001, 1002, 1010, 1011, 1012, 1020, 1021, 1022, 1100, 1101, 1102, 1110, 1111, 1112, 1120, 1121, 1122, 1200, 1201, 1202, 1210, 1211
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| Contribution from Rick L. Shepherd (rshepherd2(AT)hotmail.com), Jun 25 2009: (Start)
Nonnegative integers with no decimal digit > 2.
Thus nonnegative integers in base 10 whose quadrupling by normal addition or multiplication requires no carry operation. (End)
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REFERENCES
| N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| T. D. Noe, Table of n, a(n) for n = 1..10000
Author?, Tai Xuan Jing Symbols
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FORMULA
| a(0)=0 a(n)=10*a(n/3) if n==0 (mod 3) a(n)=a(n-1)+1 otherwise. - Benoit Cloitre, Dec 22, 2002
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MATHEMATICA
| Table[ FromDigits[ IntegerDigits[n, 3]], {n, 0, 50}]
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PROG
| (PARI) a(n)=if(n<1, 0, if(n%3, a(n-1)+1, 10*a(n/3)))
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CROSSREFS
| Cf. A000042, A007088, A007090, A007091, A007092, A007093, A007094 & A007095.
Sequence in context: A121717 A106518 A158304 * A159952 A136820 A136810
Adjacent sequences: A007086 A007087 A007088 * A007090 A007091 A007092
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KEYWORD
| base,nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Robert G. Wilson v (rgwv(AT)rgwv.com)
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EXTENSIONS
| More terms from James A. Sellers (sellersj(AT)math.psu.edu), May 01 2000
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