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A115273
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Floor(n/3)*(n mod 3).
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2
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1, 2, 0, 2, 4, 0, 3, 6, 0, 4, 8, 0, 5, 10, 0, 6, 12, 0, 7, 14, 0, 8, 16, 0, 9, 18, 0, 10, 20, 0, 11, 22, 0, 12, 24, 0, 13, 26, 0, 14, 28, 0, 15, 30, 0, 16, 32, 0, 17, 34, 0, 18, 36, 0, 19, 38, 0, 20, 40, 0, 21, 42, 0, 22, 44, 0, 23, 46, 0, 24, 48, 0, 25, 50, 0, 26, 52, 0, 27, 54, 0, 28, 56
(list; graph; refs; listen; history; internal format)
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OFFSET
| 4,2
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COMMENTS
| Three arithmetic progressions interlaced: a(1)=1,2,0 and d=a(n+1)-a(n)=1,2,0. Cf. A115274(n)=n+A115273(n), n=1,2,3,...
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FORMULA
| a(3k+1)=k, a(3k+2)=2k, a(3k+3)=0, k=1, 2, ...
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MATHEMATICA
| Table[Floor[n/3]*Mod[n, 3], {n, 4, 104}]
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CROSSREFS
| Cf. A115274.
Sequence in context: A061930 A199335 A141660 * A194759 A126440 A131186
Adjacent sequences: A115270 A115271 A115272 * A115274 A115275 A115276
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KEYWORD
| nonn
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AUTHOR
| Zak Seidov (zakseidov(AT)yahoo.com), Jan 18 2006
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