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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A380034 Records in A380032.

Original entry on oeis.org

1, 2, 3, 4, 5, 6, 7, 9, 12, 13, 14, 15, 17, 21, 28, 31, 35, 41, 42, 45, 51, 54, 60, 61, 67, 75, 89, 90, 111, 118, 133, 147, 155, 163, 176, 185, 186, 195, 205, 231, 246, 277, 307, 323, 343, 368, 369, 377, 383, 411, 429, 455, 471, 479, 490, 502, 545, 565, 567, 627
Offset: 1

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Author

Michael De Vlieger, Jan 11 2025

Keywords

Comments

See comments in A380032.

Crossrefs

Programs

  • Mathematica
    (* Load function f at A025487 *)
    r = 0;
    s = Select[Union@ Flatten@ f[8][[3 ;; -1]], Not @* SquareFreeQ];
    nn = Length[s]; Print[nn];
    Reap[Monitor[
      Do[k = s[[i]];
        If[# > r, r = #; Sow[r]] &@
          Count[Transpose@ {#, k/#} &@ #[[2 ;; Ceiling[Length[#]/2]]] &@ Divisors[k],
            _?((m = GCD @@ {##};
              And[! MemberQ[{1, #2}, m],
              m == #1,
              ! Divisible[#1, rad[#2]]]) & @@ # &)], {i, nn}], i] ][[-1, 1]]
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