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A026184
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a(n) = (1/3)*s(n), where s(n) is the n-th multiple of 3 in A026136.
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3
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1, 3, 5, 2, 7, 9, 11, 4, 13, 15, 17, 6, 19, 21, 23, 8, 25, 27, 29, 10, 31, 33, 35, 12, 37, 39, 41, 14, 43, 45, 47, 16, 49, 51, 53, 18, 55, 57, 59, 20, 61, 63, 65, 22, 67, 69, 71, 24, 73, 75, 77, 26, 79, 81, 83, 28, 85, 87, 89, 30, 91, 93, 95
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OFFSET
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1,2
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LINKS
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FORMULA
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a(4*n) = 2*n, a(4*n+1) = 6*n+1, a(4*n+2) = 6*n+3, a(4*n+3) = 6*n+5 . - Philippe Deléham, Nov 02 2023
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MATHEMATICA
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Block[{a, r, s, nn = 141}, a[1] = 1; Do[If[! IntegerQ[a[#1]], Set[a[#1], i], Set[a[#2], i]] & @@ {i - #, i + #} &@ Floor[i/2], {i, 2 nn}]; Select[TakeWhile[Array[a[#] &, nn], IntegerQ], Mod[#, 3] == 0 &]/3] (* Michael De Vlieger, Aug 27 2021 *)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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