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Search: id:A075319
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| A075319 |
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Pair the odd numbers such that the k-th pair is (r, r+2k) where r is the smallest odd number not included earlier: (1,3),(5,9),(7,13),(11,19),(15,25),(17,29),(21,35),(23,39),(27,45),... This is the sequence of the sum of the members of pairs. |
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+0
4
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| 4, 14, 20, 30, 40, 46, 56, 62, 72, 82, 88, 98, 108, 114, 124, 130, 140, 150, 156, 166, 172, 182, 192, 198, 208, 218, 224, 234, 240, 250, 260, 266, 276, 286, 292, 302, 308, 318, 328, 334, 344, 350, 360, 370, 376, 386, 396, 402, 412, 418, 428, 438, 444, 454, 460
(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)=A075317(n)+A075318(n). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 12 2006
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MAPLE
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A075319 := proc(nmax) local r, k, a, pairs ; a := [4] ; pairs := [1, 3] ; k := 2 ; r := 5 ; while nops(a) < nmax do while r in pairs do r := r+2 ; od ; if r+2*k in pairs then printf("inconsistency", k) ; fi ; a := [op(a), 2*(r+k)] ; pairs := [op(pairs), r, r+2*k] ; k := k+1 ; od ; RETURN(a) ; end: a := A075319(200) : for n from 1 to nops(a) do printf("%d, ", op(n, a)) ; od ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 12 2006
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CROSSREFS
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Cf. A075317, A075318, A075320.
Sequence in context: A035401 A139330 A051448 this_sequence A030470 A165721 A051806
Adjacent sequences: A075316 A075317 A075318 this_sequence A075320 A075321 A075322
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 14 2002
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 12 2006
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