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Search: id:A121718
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| A121718 |
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Write 0, 1, ..., n in base 3 and add as if they were decimal numbers. |
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+0
2
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| 0, 1, 3, 13, 24, 36, 56, 77, 99, 199, 300, 402, 512, 623, 735, 855, 976, 1098, 1298, 1499, 1701, 1911, 2122, 2334, 2554, 2775, 2997, 3997, 4998, 6000, 7010, 8021, 9033, 10053, 11074, 12096, 13196, 14297, 15399, 16509, 17620, 18732, 19852, 20973, 22095
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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This is to A007089 as A067894 is to A007088.
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EXAMPLE
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a(5) = 36 = 0 + 1 + 2 + 10 + 11 + 12.
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MATHEMATICA
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f[n_] := Apply[Plus, Table[ FromDigits[ IntegerDigits[i, 3]], {i, 0, n}]]; Table[ f@n, {n, 0, 45}] (* Robert G. Wilson v Sep 10 2006 *)
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CROSSREFS
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Cf. A007088, A007089, A067894.
Sequence in context: A090146 A133313 A102010 this_sequence A144826 A030552 A146371
Adjacent sequences: A121715 A121716 A121717 this_sequence A121719 A121720 A121721
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KEYWORD
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base,easy,nonn
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AUTHOR
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Jonathan Vos Post (jvospost3(AT)gmail.com), Sep 08 2006
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