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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A206716 (1/5)A206715.

Original entry on oeis.org

1, 2, 3, 4, 6, 8, 9, 12, 13, 15, 16, 17, 18, 19, 21, 24, 25, 26, 27, 30, 32, 33, 34, 35, 36, 38, 39, 42, 43, 45, 47, 48, 49, 50, 51, 52, 54, 60, 64, 65, 66, 67, 68, 70, 72, 73, 76, 78, 84, 86, 90, 91, 94, 96, 97, 98, 99, 100, 102, 104, 105, 108, 117, 120, 121, 128
Offset: 1

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Author

Clark Kimberling, Feb 11 2012

Keywords

Comments

It is conjectured that all the terms of this sequence are integers; this may be equivalent to the conjecture at A131853.

Crossrefs

Programs

  • Mathematica
    t = Table[IntegerDigits[n, 2], {n, 1, 3000}];
    b[n_] := Reverse[Table[x^k, {k, 0, n}]]
    p[n_, x_] := p[n, x] = t[[n]].b[-1 + Length[t[[n]]]]
    TableForm[Table[{n, p[n, x], Factor[p[n, x]]},
      {n, 1, 16}]]
    u = {}; Do[n++; If[(p[n, x] /. x -> I) == 0,
      AppendTo[u, n]], {n, 800}]
    u    (* A206715 *)
    u/5  (* A206716 *)
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