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.

A258264 Numbers having only one representation as a sum of the minimal number of triangular numbers, A000217.

Original entry on oeis.org

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 18, 20, 21, 22, 24, 25, 27, 28, 29, 30, 34, 36, 37, 38, 39, 43, 45, 48, 49, 50, 53, 55, 57, 58, 60, 61, 64, 65, 66, 67, 69, 70, 73, 78, 79, 83, 84, 87, 88, 90, 91, 92, 93, 97, 99, 100, 101, 102, 105, 108, 110
Offset: 1

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Author

Martin Renner, May 25 2015

Keywords

Comments

A258257(a(n)) = 1.
Complement of A258265.

Crossrefs

Programs

  • Mathematica
    t[n_] := n (n + 1)/2; ok[n_] := Block[{k = 1, t, tt = t /@ Range[ Sqrt[2*n]]}, While[{} == (r = IntegerPartitions[n, {k}, tt]), k++]; Length@ r == 1]; Select[Range[100], ok]