cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A356220 a(n) = A108598(A001950(n)).

Original entry on oeis.org

3, 9, 12, 18, 23, 27, 32, 36, 41, 47, 50, 56, 61, 65, 70, 74, 79, 85, 88, 94, 97, 103, 108, 112, 117, 123, 126, 132, 135, 141, 146, 150, 155, 161, 164, 170, 173, 179, 184, 188, 193, 197, 202, 208, 211, 217, 222, 226, 231, 235, 240, 246, 249, 255, 258, 264
Offset: 1

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Author

Clark Kimberling, Nov 13 2022

Keywords

Comments

This is the fourth of four sequences that partition the positive integers. See A356217.

Examples

			(1)  v o u = (2, 6, 8, 13, 17, 20, 24, 26, 31, 35, 38, 42, ...) = A356217
(2)  v' o u = (1, 5, 7, 10, 14, 16, 19, 21, 25, 28, 30, 34, ...) = A356218
(3)  v o u' = (4, 11, 15, 22, 29, 33, 40, 44, 51, 58, 62, 76, ...) = A190509
(4)  v' o u' = (3, 9, 12, 18, 23, 27, 32, 36, 41, 47, 50, 56, ...) = A356220
		

Crossrefs

Cf. A000201, A001950, A022839, A108598, A351415 (intersections), A356104 (reverse composites), A356217, A356218, A356219.

Programs

  • Mathematica
    z = 1000;
    u = Table[Floor[n*(1 + Sqrt[5])/2], {n, 1, z}];  (* A000201 *)
    u1 = Complement[Range[Max[u]], u];  (* A001950 *)
    v = Table[Floor[n*Sqrt[5]], {n, 1, z}];  (* A022839 *)
    v1 = Complement[Range[Max[v]], v];  (* A108598 *)
    zz = 120;
    Table[v[[u[[n]]]], {n, 1, z/4}]   (* A356217 *)
    Table[v1[[u[[n]]]], {n, 1, z/4}]  (* A356218 *)
    Table[v[[u1[[n]]]], {n, 1, z/4}]  (* A190509 *)
    Table[v1[[u1[[n]]]], {n, 1, z/4}] (* A356220 *)
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