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Search: id:A113778
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| A113778 |
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Invert blocks of four in the sequence of natural numbers. |
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+0
1
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| 4, 3, 2, 1, 8, 7, 6, 5, 12, 11, 10, 9, 16, 15, 14, 13, 20, 19, 18, 17, 24, 23, 22, 21, 28, 27, 26, 25, 32, 31, 30, 29, 36, 35, 34, 33, 40, 39, 38, 37
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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a(n)=k*floor((n+k-1)/k)-(n-1) mod k; k=4, n=1, 2, ...
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MATHEMATICA
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With[{k=4}, Table[k Floor[(n+k-1)/k]-Mod[n-1, k], {n, 1, 10k}]]
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CROSSREFS
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Cf. A113655.
Sequence in context: A085064 A030587 A051623 this_sequence A129154 A055115 A108438
Adjacent sequences: A113775 A113776 A113777 this_sequence A113779 A113780 A113781
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KEYWORD
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nonn
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AUTHOR
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Zak Seidov (zakseidov(AT)yahoo.com), Jan 20 2006
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