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.

Showing 1-1 of 1 results.

A379594 Records in A379592.

Original entry on oeis.org

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 17, 18, 19, 20, 21, 23, 24, 27, 28, 29, 31, 32, 34, 35, 36, 39, 41, 44, 47, 48, 49, 53, 55, 59, 62, 63, 71, 72, 74, 83, 84, 89, 95, 96, 104, 107, 111, 119, 120, 125, 127, 134, 139, 143, 149, 159, 161, 167, 179, 180
Offset: 1

Views

Author

Michael De Vlieger, Dec 30 2024

Keywords

Comments

See comments in A379593.
Compare with A036965 and A379554.

Crossrefs

Programs

  • Mathematica
    (* Load function f at A025487 *)
    r = 0; s = Union@ Flatten@ f[10]; nn = Length[s];
    rad[x_] := Times @@ FactorInteger[x][[All, 1]];
      Transpose@ Reap[Monitor[
        Do[k = s[[i]];
          If[# > r, r = #; Sow[r]] &@
            Count[Transpose@ {#, k/#} &@ #[[2 ;; Ceiling[Length[#]/2]]] &@ Divisors[k],
              _?(And[rad[#1] == rad[#2],
                Xor[Divisible[#2, #1],
                    Divisible[#1, #2]]] & @@ # &)], {i, nn}], {i, nn}] ][[-1, 1]]
Showing 1-1 of 1 results.